diff --git a/dlls/ole32/tests/marshal.c b/dlls/ole32/tests/marshal.c
index c7f79961bcf..acea8545ed4 100644
--- a/dlls/ole32/tests/marshal.c
+++ b/dlls/ole32/tests/marshal.c
@@ -29,6 +29,7 @@
 #include "winbase.h"
 #include "objbase.h"
 #include "shlguid.h"
+#include "shobjidl.h"
 
 #include "wine/test.h"