diff --git a/src/media.c b/src/media.c
index 287ec84d..ddcc7603 100644
--- a/src/media.c
+++ b/src/media.c
@@ -196,7 +196,7 @@ void delete_StatefulJxlDecoder(iStatefulJxlDecoder *s) {
 }
 
 static int compare_MapNode_(iMapKey a, iMapKey b) {
-    return a < b;
+    return (a > b) - (a < b);
 }
 
 static uint8_t *loadJxl_(const iBlock *data, iInt2 *imSize, iGmLinkId linkId, iBool isPartial) {