diff --git a/trunk/desmume/src/types.h b/trunk/desmume/src/types.h
index 14848e8fb..be04a9a53 100644
--- a/trunk/desmume/src/types.h
+++ b/trunk/desmume/src/types.h
@@ -107,6 +107,10 @@ typedef int BOOL;
 # define LOCAL_TO_LE_32(x) (x)
 #endif
 
+/* kilobytes and megabytes macro */
+#define MB(x) ((x)*1024*1024)
+#define KB(x) ((x)*1024)
+
 typedef enum
 {
 	ARM9 = 0,