diff --git a/contrib/c-bindings/gf_lexing.c b/contrib/c-bindings/gf_lexing.c
index 21353ec8b..4179db73f 100644
--- a/contrib/c-bindings/gf_lexing.c
+++ b/contrib/c-bindings/gf_lexing.c
@@ -246,6 +246,7 @@ static char *unlexText(char **arr)
     } else cap = 0;
     *(r++) = ' ';
   }
+  *r = 0;
   return result;
 
 }