diff --git a/include/winnt.h b/include/winnt.h
index d1c82084f9f..0af765652b7 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -180,7 +180,10 @@ extern "C" {
 
 /* a couple of useful Wine extensions */
 
-#ifdef _MSC_VER
+#if defined(__WINESRC__) && !defined(WINE_UNIX_LIB)
+/* Wine uses .spec file for PE exports */
+# define DECLSPEC_EXPORT
+#elif defined(_MSC_VER)
 # define DECLSPEC_EXPORT __declspec(dllexport)
 #elif defined(__MINGW32__)
 # define DECLSPEC_EXPORT __attribute__((dllexport))