1 files changed, 1 insertions, 1 deletions
diff --git a/mappingdata.h b/mappingdata.h
index 00cf52a..44f2c2c 100644
--- a/mappingdata.h
+++ b/mappingdata.h
@@ -14,7 +14,7 @@
 
 struct MappingData {
     MappingData();
-    bool operator==(const MappingData &other);
+    bool operator==(const MappingData &other) const;
     bool isValid();
     int mappingId;
     int descId;