diff --git a/include/reactos/wine/port.h b/include/reactos/wine/port.h
index 6b293173ec2..b5c93b8054b 100644
--- a/include/reactos/wine/port.h
+++ b/include/reactos/wine/port.h
@@ -150,7 +150,11 @@ struct statfs;
 
 /* Constructor functions */
 
-#ifdef __GNUC__
+#ifdef _MSC_VER // ReactOS
+#pragma message("DECL_GLOBAL_CONSTRUCTOR is not properly defined")
+# define DECL_GLOBAL_CONSTRUCTOR(func) \
+    static void func(void)
+#elif defined(__GNUC__)
 # define DECL_GLOBAL_CONSTRUCTOR(func) \
     static void func(void) __attribute__((constructor)); \
     static void func(void)