diff --git a/src/ld65/cfg/apple2-dos33.cfg b/src/ld65/cfg/apple2-dos33.cfg
index ca8458b8c..22168e4b2 100644
--- a/src/ld65/cfg/apple2-dos33.cfg
+++ b/src/ld65/cfg/apple2-dos33.cfg
@@ -38,5 +38,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2-loader.cfg b/src/ld65/cfg/apple2-loader.cfg
index c8898c5c0..f79e0a8c0 100644
--- a/src/ld65/cfg/apple2-loader.cfg
+++ b/src/ld65/cfg/apple2-loader.cfg
@@ -38,5 +38,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2-reboot.cfg b/src/ld65/cfg/apple2-reboot.cfg
index 302fb6dce..f49c74ec2 100644
--- a/src/ld65/cfg/apple2-reboot.cfg
+++ b/src/ld65/cfg/apple2-reboot.cfg
@@ -39,5 +39,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2-system.cfg b/src/ld65/cfg/apple2-system.cfg
index 297fd3422..9a59946a0 100644
--- a/src/ld65/cfg/apple2-system.cfg
+++ b/src/ld65/cfg/apple2-system.cfg
@@ -35,5 +35,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2.cfg b/src/ld65/cfg/apple2.cfg
index e1ef86597..577caab1b 100644
--- a/src/ld65/cfg/apple2.cfg
+++ b/src/ld65/cfg/apple2.cfg
@@ -38,5 +38,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2enh-dos33.cfg b/src/ld65/cfg/apple2enh-dos33.cfg
index ca8458b8c..22168e4b2 100644
--- a/src/ld65/cfg/apple2enh-dos33.cfg
+++ b/src/ld65/cfg/apple2enh-dos33.cfg
@@ -38,5 +38,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2enh-loader.cfg b/src/ld65/cfg/apple2enh-loader.cfg
index c8898c5c0..f79e0a8c0 100644
--- a/src/ld65/cfg/apple2enh-loader.cfg
+++ b/src/ld65/cfg/apple2enh-loader.cfg
@@ -38,5 +38,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2enh-reboot.cfg b/src/ld65/cfg/apple2enh-reboot.cfg
index 302fb6dce..f49c74ec2 100644
--- a/src/ld65/cfg/apple2enh-reboot.cfg
+++ b/src/ld65/cfg/apple2enh-reboot.cfg
@@ -39,5 +39,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2enh-system.cfg b/src/ld65/cfg/apple2enh-system.cfg
index 297fd3422..9a59946a0 100644
--- a/src/ld65/cfg/apple2enh-system.cfg
+++ b/src/ld65/cfg/apple2enh-system.cfg
@@ -35,5 +35,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/apple2enh.cfg b/src/ld65/cfg/apple2enh.cfg
index e1ef86597..577caab1b 100644
--- a/src/ld65/cfg/apple2enh.cfg
+++ b/src/ld65/cfg/apple2enh.cfg
@@ -38,5 +38,5 @@ FEATURES {
             count   = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $0800; # 2k stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/atari.cfg b/src/ld65/cfg/atari.cfg
index 8d949c680..1b8ee8b2a 100644
--- a/src/ld65/cfg/atari.cfg
+++ b/src/ld65/cfg/atari.cfg
@@ -2,8 +2,8 @@ FEATURES {
     STARTADDRESS: default = $2E00;
 }
 SYMBOLS {
-    __STACKSIZE__	= $800;		# 2K stack
-    __RESERVED_MEMORY__: value = $0, weak = yes;
+    __STACKSIZE__:       value = $0800, weak = yes; # 2k stack
+    __RESERVED_MEMORY__: value = $0000, weak = yes;
 }
 MEMORY {
     ZP:      start = $0082, size = $007E, type = rw, define = yes;
diff --git a/src/ld65/cfg/atmos.cfg b/src/ld65/cfg/atmos.cfg
index 5ab8702dd..b6a3704d5 100644
--- a/src/ld65/cfg/atmos.cfg
+++ b/src/ld65/cfg/atmos.cfg
@@ -31,7 +31,7 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
 
 
diff --git a/src/ld65/cfg/bbc.cfg b/src/ld65/cfg/bbc.cfg
index e1b2f771f..fa3069e65 100644
--- a/src/ld65/cfg/bbc.cfg
+++ b/src/ld65/cfg/bbc.cfg
@@ -28,7 +28,7 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
 
 
diff --git a/src/ld65/cfg/c128.cfg b/src/ld65/cfg/c128.cfg
index e659300b3..155288713 100644
--- a/src/ld65/cfg/c128.cfg
+++ b/src/ld65/cfg/c128.cfg
@@ -29,5 +29,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/c16.cfg b/src/ld65/cfg/c16.cfg
index 9f77f6a83..0117d34e1 100644
--- a/src/ld65/cfg/c16.cfg
+++ b/src/ld65/cfg/c16.cfg
@@ -29,5 +29,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/c64.cfg b/src/ld65/cfg/c64.cfg
index 1e8983ffd..425f2a8bc 100644
--- a/src/ld65/cfg/c64.cfg
+++ b/src/ld65/cfg/c64.cfg
@@ -29,7 +29,7 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
 
 
diff --git a/src/ld65/cfg/cbm510.cfg b/src/ld65/cfg/cbm510.cfg
index 29a398155..5bbd75540 100644
--- a/src/ld65/cfg/cbm510.cfg
+++ b/src/ld65/cfg/cbm510.cfg
@@ -38,5 +38,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $781;      	# ~2K stack
+    __STACKSIZE__: value = $0781, weak = yes; # ~2k stack
 }
diff --git a/src/ld65/cfg/cbm610.cfg b/src/ld65/cfg/cbm610.cfg
index 497969e1e..5626452a5 100644
--- a/src/ld65/cfg/cbm610.cfg
+++ b/src/ld65/cfg/cbm610.cfg
@@ -36,5 +36,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/geos.cfg b/src/ld65/cfg/geos.cfg
index 53e4e09f6..05673385d 100644
--- a/src/ld65/cfg/geos.cfg
+++ b/src/ld65/cfg/geos.cfg
@@ -31,5 +31,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $400;	# 1K stack
+    __STACKSIZE__: value = $0400, weak = yes; # 1k stack
 }
diff --git a/src/ld65/cfg/lunix.cfg b/src/ld65/cfg/lunix.cfg
index 84b721d88..946e405f6 100644
--- a/src/ld65/cfg/lunix.cfg
+++ b/src/ld65/cfg/lunix.cfg
@@ -36,6 +36,6 @@ FORMATS {
          import = LUNIXKERNEL;	# Kernel entry-points
 }
 SYMBOLS {
-    __HEAPSIZE__  = $2000;      # 8k heap [temporary, until LUnix malloc() exists]
-    __STACKSIZE__ = $0400;      # 1k stack (do typical LUnix apps. need 2k?)
+    __HEAPSIZE__:  value = $2000, weak = yes; # 8k heap [temporary, until LUnix malloc() exists]
+    __STACKSIZE__: value = $0400, weak = yes; # 1k stack (do typical LUnix apps. need 2k?)
 }
diff --git a/src/ld65/cfg/lynx.cfg b/src/ld65/cfg/lynx.cfg
index c277528d7..8aee49f2c 100644
--- a/src/ld65/cfg/lynx.cfg
+++ b/src/ld65/cfg/lynx.cfg
@@ -32,5 +32,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;       # 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/nes.cfg b/src/ld65/cfg/nes.cfg
index ebbc32bc7..2e2bb108e 100644
--- a/src/ld65/cfg/nes.cfg
+++ b/src/ld65/cfg/nes.cfg
@@ -63,5 +63,5 @@ FEATURES {
 }
 
 SYMBOLS {
-    __STACKSIZE__ = $0300;  	# 3 pages stack
+    __STACKSIZE__: value = $0300, weak = yes; # 3 pages stack
 }
diff --git a/src/ld65/cfg/none.cfg b/src/ld65/cfg/none.cfg
index 79b3d4f88..7d89bcf6c 100644
--- a/src/ld65/cfg/none.cfg
+++ b/src/ld65/cfg/none.cfg
@@ -27,5 +27,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/pet.cfg b/src/ld65/cfg/pet.cfg
index 2c4ab0b4d..5385b3c98 100644
--- a/src/ld65/cfg/pet.cfg
+++ b/src/ld65/cfg/pet.cfg
@@ -29,6 +29,6 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
 
diff --git a/src/ld65/cfg/plus4.cfg b/src/ld65/cfg/plus4.cfg
index 607185e61..6c45a63b1 100644
--- a/src/ld65/cfg/plus4.cfg
+++ b/src/ld65/cfg/plus4.cfg
@@ -29,5 +29,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $800;	# 2K stack
+    __STACKSIZE__: value = $0800, weak = yes; # 2k stack
 }
diff --git a/src/ld65/cfg/vic20-32k.cfg b/src/ld65/cfg/vic20-32k.cfg
index 1b164fc4b..1ff9fc0b1 100644
--- a/src/ld65/cfg/vic20-32k.cfg
+++ b/src/ld65/cfg/vic20-32k.cfg
@@ -30,5 +30,5 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $400;	# 1K stack
+    __STACKSIZE__: value = $0400, weak = yes; # 1k stack
 }
diff --git a/src/ld65/cfg/vic20.cfg b/src/ld65/cfg/vic20.cfg
index 1afac90cd..11686f124 100644
--- a/src/ld65/cfg/vic20.cfg
+++ b/src/ld65/cfg/vic20.cfg
@@ -29,7 +29,8 @@ FEATURES {
 	    count = __INTERRUPTOR_COUNT__;
 }
 SYMBOLS {
-    __STACKSIZE__ = $400;	# 1K stack
+    __STACKSIZE__: value = $0400, weak = yes; # 1k stack
+
 }