diff --git a/kernel/rtmutex-tester.c b/kernel/rtmutex-tester.c
index 494dac8..948bd8f 100644
--- a/kernel/rtmutex-tester.c
+++ b/kernel/rtmutex-tester.c
@@ -275,6 +275,7 @@
 
 		/* Wait for the next command to be executed */
 		schedule();
+		try_to_freeze();
 
 		if (signal_pending(current))
 			flush_signals(current);