diff --git a/src/pkg/os/dir_darwin.go b/src/pkg/os/dir_darwin.go
index 7917daec6b..f9f51221da 100644
--- a/src/pkg/os/dir_darwin.go
+++ b/src/pkg/os/dir_darwin.go
@@ -58,7 +58,7 @@ func (file *File) Readdirnames(count int) (names []string, err Error) {
 			if dirent.Ino == 0 { // File absent in directory.
 				continue
 			}
-			bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
+			bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
 			var name = string(bytes[0:dirent.Namlen])
 			if name == "." || name == ".." { // Useless names
 				continue
diff --git a/src/pkg/os/dir_freebsd.go b/src/pkg/os/dir_freebsd.go
index 7a0290ac6a..b32c474e69 100644
--- a/src/pkg/os/dir_freebsd.go
+++ b/src/pkg/os/dir_freebsd.go
@@ -53,7 +53,7 @@ func (file *File) Readdirnames(count int) (names []string, err Error) {
 			if dirent.Fileno == 0 { // File absent in directory.
 				continue
 			}
-			bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
+			bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
 			var name = string(bytes[0:dirent.Namlen])
 			if name == "." || name == ".." { // Useless names
 				continue
diff --git a/src/pkg/os/dir_linux.go b/src/pkg/os/dir_linux.go
index 84f87007ed..42cc88a8a7 100644
--- a/src/pkg/os/dir_linux.go
+++ b/src/pkg/os/dir_linux.go
@@ -56,7 +56,7 @@ func (file *File) Readdirnames(count int) (names []string, err Error) {
 			if dirent.Ino == 0 { // File absent in directory.
 				continue
 			}
-			bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
+			bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
 			var name = string(bytes[0:clen(bytes[0:])])
 			if name == "." || name == ".." { // Useless names
 				continue
diff --git a/src/pkg/os/dir_nacl.go b/src/pkg/os/dir_nacl.go
index e693794f02..e76b2bea09 100644
--- a/src/pkg/os/dir_nacl.go
+++ b/src/pkg/os/dir_nacl.go
@@ -56,7 +56,7 @@ func (file *File) Readdirnames(count int) (names []string, err Error) {
 			if dirent.Ino == 0 { // File absent in directory.
 				continue
 			}
-			bytes := (*[len(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
+			bytes := (*[10000]byte)(unsafe.Pointer(&dirent.Name[0]))
 			var name = string(bytes[0:clen(bytes)])
 			if name == "." || name == ".." { // Useless names
 				continue
diff --git a/src/pkg/syscall/syscall_bsd.go b/src/pkg/syscall/syscall_bsd.go
index 14dfab1539..66be580e7d 100644
--- a/src/pkg/syscall/syscall_bsd.go
+++ b/src/pkg/syscall/syscall_bsd.go
@@ -239,8 +239,8 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
 				break
 			}
 		}
-		bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))
-		sa.Name = string(bytes[0:n])
+		bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
+		sa.Name = string(bytes)
 		return sa, 0
 
 	case AF_INET:
diff --git a/src/pkg/syscall/syscall_linux.go b/src/pkg/syscall/syscall_linux.go
index 2ce3c08828..8442d8485c 100644
--- a/src/pkg/syscall/syscall_linux.go
+++ b/src/pkg/syscall/syscall_linux.go
@@ -284,8 +284,8 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
 		for n < len(pp.Path) && pp.Path[n] != 0 {
 			n++
 		}
-		bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))
-		sa.Name = string(bytes[0:n])
+		bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
+		sa.Name = string(bytes)
 		return sa, 0
 
 	case AF_INET: