diff --git a/ext/gd/config.w32 b/ext/gd/config.w32
index 96c43dd90e583..e4be16cb406b4 100644
--- a/ext/gd/config.w32
+++ b/ext/gd/config.w32
@@ -88,7 +88,6 @@ if (PHP_GD != "no") {
 /D HAVE_COLORCLOSESTHWB  \
 /D HAVE_GD_GET_INTERPOLATION \
 /D USE_GD_IOCTX \
-/D MSWIN32 \
 		");
 		if (ICC_TOOLSET) {
 			ADD_FLAG("LDFLAGS_GD", "/nodefaultlib:libcmt");
diff --git a/ext/gd/libgd/gdft.c b/ext/gd/libgd/gdft.c
index b23b7563b4c25..554a656e625c9 100644
--- a/ext/gd/libgd/gdft.c
+++ b/ext/gd/libgd/gdft.c
@@ -12,7 +12,7 @@
 #include "gd.h"
 #include "gdhelpers.h"
 
-#ifndef MSWIN32
+#ifndef _WIN32
 #include <unistd.h>
 #else
 #include <io.h>