diff --git a/sched/environ/env_putenv.c b/sched/environ/env_putenv.c
index ce70af47bff..8a7aad23002 100644
--- a/sched/environ/env_putenv.c
+++ b/sched/environ/env_putenv.c
@@ -93,7 +93,7 @@ int putenv(FAR const char *string)
       ret = setenv(pname, pequal + 1, TRUE);
     }
 
-  lib_free(pname);
+  kmm_free(pname);
   return ret;
 
 errout: