diff --git a/Python/pystate.c b/Python/pystate.c
index 138dc0989d9..bdb456b0694 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -151,7 +151,7 @@ PyThreadState_Clear(tstate)
 {
 	if (tstate->frame != NULL)
 		fprintf(stderr,
-		  "PyThreadState_Clear: warning: thread still has a frame");
+		  "PyThreadState_Clear: warning: thread still has a frame\n");
 
 	ZAP(tstate->frame);