diff --git a/dumb/include/internal/mulsc.h b/dumb/include/internal/mulsc.h
new file mode 100644
index 000000000..57d6ec291
--- /dev/null
+++ b/dumb/include/internal/mulsc.h
@@ -0,0 +1,36 @@
+#ifndef INTERNAL_MULSC_H
+#define INTERNAL_MULSC_H
+
+#if !defined(_MSC_VER) || !defined(_M_IX86) || _MSC_VER >= 1800
+//#define MULSC(a, b) ((int)((LONG_LONG)(a) * (b) >> 16))
+//#define MULSC(a, b) ((a) * ((b) >> 2) >> 14)
+#define MULSCV(a, b) ((int)((LONG_LONG)(a) * (b) >> 32))
+#define MULSCA(a, b) ((int)((LONG_LONG)((a) << 4) * (b) >> 32))
+#define MULSC(a, b) ((int)((LONG_LONG)((a) << 4) * ((b) << 12) >> 32))
+#define MULSC16(a, b) ((int)((LONG_LONG)((a) << 12) * ((b) << 12) >> 32))
+#else
+/* VC++ calls __allmull and __allshr for the above math. I don't know why.
+ * [Need to check if this still applies to recent versions of the compiler.] */
+static __forceinline unsigned long long MULLL(int a, int b)
+{
+	__asm mov eax,a
+	__asm imul b
+}
+static __forceinline int MULSCV (int a, int b)
+{
+#ifndef _DEBUG
+	union { unsigned long long q; struct { int l, h; }; } val;
+	val.q = MULLL(a,b);
+	return val.h;
+#else
+	__asm mov eax,a
+	__asm imul b
+	__asm mov eax,edx
+#endif
+}
+#define MULSCA(a, b)  MULSCV((a) << 4, b)
+#define MULSC(a, b)   MULSCV((a) << 4, (b) << 12)
+#define MULSC16(a, b) MULSCV((a) << 12, (b) << 12)
+#endif
+
+#endif /* INTERNAL_MULSC_H */
\ No newline at end of file
diff --git a/dumb/src/helpers/resample.c b/dumb/src/helpers/resample.c
index 52b8e0f5d..a042775a0 100644
--- a/dumb/src/helpers/resample.c
+++ b/dumb/src/helpers/resample.c
@@ -46,6 +46,7 @@
 #include "dumb.h"
 
 #include "internal/resampler.h"
+#include "internal/mulsc.h"
 
 
 
@@ -85,36 +86,6 @@ int dumb_resampling_quality = DUMB_RQ_CUBIC;
 
 
 
-#if !defined(_MSC_VER) || !defined(_M_IX86) || _MSC_VER >= 1800
-//#define MULSC(a, b) ((int)((LONG_LONG)(a) * (b) >> 16))
-//#define MULSC(a, b) ((a) * ((b) >> 2) >> 14)
-#define MULSCV(a, b) ((int)((LONG_LONG)(a) * (b) >> 32))
-#define MULSC(a, b) ((int)((LONG_LONG)((a) << 4) * ((b) << 12) >> 32))
-#define MULSC16(a, b) ((int)((LONG_LONG)((a) << 12) * ((b) << 12) >> 32))
-#else
-/* VC++ calls __allmull and __allshr for the above math. I don't know why.
- * [Need to check if this still applies to recent versions of the compiler.] */
-static __forceinline unsigned long long MULLL(int a, int b)
-{
-	__asm mov eax,a
-	__asm imul b
-}
-static __forceinline int MULSCV (int a, int b)
-{
-#ifndef _DEBUG
-	union { unsigned long long q; struct { int l, h; }; } val;
-	val.q = MULLL(a,b);
-	return val.h;
-#else
-	__asm mov eax,a
-	__asm imul b
-	__asm mov eax,edx
-#endif
-}
-#define MULSC(a, b)   MULSCV((a) << 4, (b) << 12)
-#define MULSC16(a, b) MULSCV((a) << 12, ((b) << 12))
-#endif
-
 /* From xs_Float.h ==============================================*/
 #if __BIG_ENDIAN__
 	#define _xs_iman_				1
diff --git a/dumb/src/it/itrender.c b/dumb/src/it/itrender.c
index df97c4991..0491e7e59 100644
--- a/dumb/src/it/itrender.c
+++ b/dumb/src/it/itrender.c
@@ -27,6 +27,7 @@
 #include "internal/lpc.h"
 
 #include "internal/resampler.h"
+#include "internal/mulsc.h"
 
 // #define BIT_ARRAY_BULLSHIT
 
@@ -601,7 +602,6 @@ static void it_filter_int(DUMB_CLICK_REMOVER *cr, IT_FILTER_STATE *state, sample
 
 #define INT_FILTERS
 #ifdef INT_FILTERS
-#define MULSCA(a, b) ((int)((LONG_LONG)((a) << 4) * (b) >> 32))
 #define SCALEB 12
 	{
 		int ai = (int)(a * (1 << (16+SCALEB)));
diff --git a/dumb/vc6/dumb_static/dumb_static.vcproj b/dumb/vc6/dumb_static/dumb_static.vcproj
index 40844c488..497fe4a99 100644
--- a/dumb/vc6/dumb_static/dumb_static.vcproj
+++ b/dumb/vc6/dumb_static/dumb_static.vcproj
@@ -2041,6 +2041,10 @@
 					RelativePath="..\..\include\internal\lpc.h"
 					>
 				</File>
+				<File
+					RelativePath="..\..\include\internal\mulsc.h"
+					>
+				</File>
 				<File
 					RelativePath="..\..\include\internal\resampler.h"
 					>