diff --git a/ext/xsl/php_xsl.c b/ext/xsl/php_xsl.c
index 63974643bca..0384334a7a4 100644
--- a/ext/xsl/php_xsl.c
+++ b/ext/xsl/php_xsl.c
@@ -131,7 +131,7 @@ PHP_MINIT_FUNCTION(xsl)
 	xsl_object_handlers.free_obj = xsl_objects_free_storage;
 
 	REGISTER_XSL_CLASS(ce, "XSLTProcessor", NULL, class_XSLTProcessor_methods, xsl_xsltprocessor_class_entry);
-#if HAVE_XSL_EXSLT
+#ifdef HAVE_XSL_EXSLT
 	exsltRegisterAll();
 #endif
 
@@ -158,7 +158,7 @@ PHP_MINIT_FUNCTION(xsl)
 	REGISTER_LONG_CONSTANT("LIBXSLT_VERSION",           LIBXSLT_VERSION,            CONST_CS | CONST_PERSISTENT);
 	REGISTER_STRING_CONSTANT("LIBXSLT_DOTTED_VERSION",  LIBXSLT_DOTTED_VERSION,     CONST_CS | CONST_PERSISTENT);
 
-#if HAVE_XSL_EXSLT
+#ifdef HAVE_XSL_EXSLT
 	REGISTER_LONG_CONSTANT("LIBEXSLT_VERSION",           LIBEXSLT_VERSION,            CONST_CS | CONST_PERSISTENT);
 	REGISTER_STRING_CONSTANT("LIBEXSLT_DOTTED_VERSION",  LIBEXSLT_DOTTED_VERSION,     CONST_CS | CONST_PERSISTENT);
 #endif
@@ -265,7 +265,7 @@ PHP_MINFO_FUNCTION(xsl)
 		snprintf(buffer, 128, "%d.%d.%d", major, minor, subminor);
 		php_info_print_table_row(2, "libxslt compiled against libxml Version", buffer);
 	}
-#if HAVE_XSL_EXSLT
+#ifdef HAVE_XSL_EXSLT
 	php_info_print_table_row(2, "EXSLT", "enabled");
 	php_info_print_table_row(2, "libexslt Version", LIBEXSLT_DOTTED_VERSION);
 #endif
diff --git a/ext/xsl/php_xsl.h b/ext/xsl/php_xsl.h
index 94d4409b361..60859250243 100644
--- a/ext/xsl/php_xsl.h
+++ b/ext/xsl/php_xsl.h
@@ -32,7 +32,7 @@ extern zend_module_entry xsl_module_entry;
 #include <libxslt/xsltutils.h>
 #include <libxslt/transform.h>
 #include <libxslt/security.h>
-#if HAVE_XSL_EXSLT
+#ifdef HAVE_XSL_EXSLT
 #include <libexslt/exslt.h>
 #include <libexslt/exsltconfig.h>
 #endif
diff --git a/ext/xsl/xsltprocessor.c b/ext/xsl/xsltprocessor.c
index 815615dec44..6693ac40216 100644
--- a/ext/xsl/xsltprocessor.c
+++ b/ext/xsl/xsltprocessor.c
@@ -862,7 +862,7 @@ PHP_METHOD(XSLTProcessor, hasExsltSupport)
 		RETURN_THROWS();
 	}
 
-#if HAVE_XSL_EXSLT
+#ifdef HAVE_XSL_EXSLT
 	RETURN_TRUE;
 #else
 	RETURN_FALSE;