diff --git a/tests/compat.sh b/tests/compat.sh
index f6a51c4fb..a6efc65db 100755
--- a/tests/compat.sh
+++ b/tests/compat.sh
@@ -1129,11 +1129,13 @@ wait_client_done() {
     ( sleep "$DOG_DELAY"; echo "TIMEOUT" >> $CLI_OUT; kill $CLI_PID ) &
     WATCHDOG_PID=$!
 
-    wait $CLI_PID
+    # For Ubuntu 22.04, `Terminated` message is outputed by wait command.
+    # To remove it from stdout, redirect stdout/stderr to CLI_OUT
+    wait $CLI_PID >> $CLI_OUT 2>&1
     EXIT=$?
 
-    kill $WATCHDOG_PID
-    wait $WATCHDOG_PID
+    kill $WATCHDOG_PID >/dev/null 2>&1
+    wait $WATCHDOG_PID >> $CLI_OUT 2>&1
 
     echo "EXIT: $EXIT" >> $CLI_OUT
 }