diff --git a/dlls/dmsynth/dmsynth_private.h b/dlls/dmsynth/dmsynth_private.h
index 3635aed5fa5..f056581edc4 100644
--- a/dlls/dmsynth/dmsynth_private.h
+++ b/dlls/dmsynth/dmsynth_private.h
@@ -104,12 +104,6 @@ typedef struct {
 } guid_info;
 
 /* used for initialising structs (primarily for DMUS_OBJECTDESC) */
-#define DM_STRUCT_INIT(x) 				\
-	do {								\
-		memset((x), 0, sizeof(*(x)));	\
-		(x)->dwSize = sizeof(*x);		\
-	} while (0)
-
 #define FE(x) { x, #x }	
 #define GE(x) { &x, #x }