diff --git a/test/TEST-27-STDOUTFILE/testsuite.sh b/test/TEST-27-STDOUTFILE/testsuite.sh
index 75559e03e5..b8fcc46e33 100755
--- a/test/TEST-27-STDOUTFILE/testsuite.sh
+++ b/test/TEST-27-STDOUTFILE/testsuite.sh
@@ -7,7 +7,7 @@ set -o pipefail
 systemd-analyze set-log-level debug
 systemd-analyze set-log-target console
 
-systemd-run --unit=one -p StandardOutput=file:/tmp/stdout -p StandardError=file:/tmp/stderr -p Type=exec sh -c 'echo x ; echo y >&2'
+systemd-run --wait --unit=one -p StandardOutput=file:/tmp/stdout -p StandardError=file:/tmp/stderr -p Type=exec sh -c 'echo x ; echo y >&2'
 cmp /tmp/stdout <<EOF
 x
 EOF
@@ -15,7 +15,7 @@ cmp /tmp/stderr <<EOF
 y
 EOF
 
-systemd-run --unit=two -p StandardOutput=file:/tmp/stdout -p StandardError=file:/tmp/stderr -p Type=exec sh -c 'echo z ; echo a >&2'
+systemd-run --wait --unit=two -p StandardOutput=file:/tmp/stdout -p StandardError=file:/tmp/stderr -p Type=exec sh -c 'echo z ; echo a >&2'
 cmp /tmp/stdout <<EOF
 z
 EOF
@@ -23,7 +23,7 @@ cmp /tmp/stderr <<EOF
 a
 EOF
 
-systemd-run --unit=three -p StandardOutput=append:/tmp/stdout -p StandardError=append:/tmp/stderr -p Type=exec sh -c 'echo b ; echo c >&2'
+systemd-run --wait --unit=three -p StandardOutput=append:/tmp/stdout -p StandardError=append:/tmp/stderr -p Type=exec sh -c 'echo b ; echo c >&2'
 cmp /tmp/stdout <<EOF
 z
 b