diff --git a/src/std/c_string.c b/src/std/c_string.c
index b853484ad..a8841c660 100644
--- a/src/std/c_string.c
+++ b/src/std/c_string.c
@@ -124,6 +124,7 @@ static char *c_iconv(const char* str, enum iconv_direction dir)
   }
 
   if (ret == (size_t)-1) {
+      SAFE_FREE(out);
       return NULL;
   }