diff --git a/win32/build/config.w32.h.in b/win32/build/config.w32.h.in
index 3e804aa7e8af5..3b636e195b05b 100644
--- a/win32/build/config.w32.h.in
+++ b/win32/build/config.w32.h.in
@@ -6,7 +6,7 @@
 /* Define the minimum supported version */
 #undef _WIN32_WINNT
 #undef NTDDI_VERSION
-#define _WIN32_WINNT 0x502
+#define _WIN32_WINNT 0x0501
 #define NTDDI_VERSION  0x05010200
 
 /* Default PHP / PEAR directories */