diff --git a/dlls/wmi/Makefile.in b/dlls/wmi/Makefile.in
index fde1177f9a5..9b6d56ab3da 100644
--- a/dlls/wmi/Makefile.in
+++ b/dlls/wmi/Makefile.in
@@ -1,3 +1,4 @@
+EXTRADEFS = -D_WMI_SOURCE_
 MODULE    = wmi.dll
 IMPORTS   = advapi32
 
diff --git a/include/wmium.h b/include/wmium.h
index 887c2b4ccf5..bbb13a3dbf4 100644
--- a/include/wmium.h
+++ b/include/wmium.h
@@ -22,7 +22,7 @@
 #ifdef _WMI_SOURCE_
 #define WMIAPI __stdcall
 #else
-#define WMIAPI DECLSPEC_HIDDEN __stdcall
+#define WMIAPI DECLSPEC_IMPORT __stdcall
 #endif
 
 #include <guiddef.h>