diff --git a/source/external/src/mac/Mac.mm b/source/external/src/mac/Mac.mm
index af86ece5..c134ba04 100644
--- a/source/external/src/mac/Mac.mm
+++ b/source/external/src/mac/Mac.mm
@@ -114,6 +114,7 @@ namespace ExternalMac
 					NSImage *tmpImage = [NSImage imageNamed:cursorImageName];
 					cursor = [[NSCursor alloc] initWithImage:tmpImage hotSpot:NSMakePoint(customX, customY)];
 					customCursorCache[cursorImageName.UTF8String] = cursor;
+					[tmpImage release];
 				}
 
 				break;