diff --git a/src/mapglyph.c b/src/mapglyph.c
index ca7e5ca33..587d317c8 100644
--- a/src/mapglyph.c
+++ b/src/mapglyph.c
@@ -316,6 +316,7 @@ const char *str;
         *put++ = *str++;
     }
     *put = '\0';
+    return buf;
 }
 
 /*