diff --git a/source/blender/src/interface.c b/source/blender/src/interface.c
index 5c4843e8664..fa54d83260e 100644
--- a/source/blender/src/interface.c
+++ b/source/blender/src/interface.c
@@ -4612,6 +4612,14 @@ static uiBut *uiDefButBit(uiBlock *block, int type, int bit, int retval, char *s
 	if (bitIdx==-1) {
 		return NULL;
 	} else {
+		if (type&BIT) {
+			int curIdx = type&31;
+
+			if (curIdx!=bitIdx) {
+				printf("ERROR: button index mismatch! (Button: %s, Correct Index: %d, Given Index: %d)\n", str, bitIdx, curIdx);
+			}
+		}
+
 		return uiDefBut(block, type|BIT|bitIdx, retval, str, x1, y1, x2, y2, poin, min, max, a1, a2, tip);
 	}
 }