diff --git a/reactos/include/wine/msacm.h b/reactos/include/wine/msacm.h
index 8e9c85b10a2..3323c2601c0 100644
--- a/reactos/include/wine/msacm.h
+++ b/reactos/include/wine/msacm.h
@@ -21,6 +21,8 @@
 #ifndef __WINE_MSACM_H
 #define __WINE_MSACM_H
 
+#include <mmreg.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* defined(__cplusplus) */