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-rw-r--r--src/strings_func.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/strings_func.h b/src/strings_func.h
index 9067f7049..2b876038b 100644
--- a/src/strings_func.h
+++ b/src/strings_func.h
@@ -72,7 +72,7 @@ int CDECL StringIDSorter(const void *a, const void *b);
/** Key comparison function for std::map */
struct StringIDCompare
{
- bool operator()(StringID s1, StringID s2) { return StringIDSorter(&s1, &s2) < 0; }
+ bool operator()(StringID s1, StringID s2) const { return StringIDSorter(&s1, &s2) < 0; }
};
void CheckForMissingGlyphsInLoadedLanguagePack();