diff --git a/test/test-execute/exec-standardoutput-truncate.service b/test/test-execute/exec-standardoutput-truncate.service
index 7a12a06923..4b4bb87b75 100644
--- a/test/test-execute/exec-standardoutput-truncate.service
+++ b/test/test-execute/exec-standardoutput-truncate.service
@@ -8,6 +8,5 @@ StandardInput=data
 StandardInputText=hi
 StandardOutput=truncate:/tmp/test-exec-standardoutput-output
 StandardError=null
-ExecStart=cat
-ExecStartPost=cmp /tmp/test-exec-standardoutput-output /tmp/test-exec-standardoutput-expected
+ExecStart=sh -c 'cat && cmp /tmp/test-exec-standardoutput-output /tmp/test-exec-standardoutput-expected'
 Type=oneshot