diff --git a/src/test/test-execute.c b/src/test/test-execute.c
index 57a4b1c282..957cc2e384 100644
--- a/src/test/test-execute.c
+++ b/src/test/test-execute.c
@@ -37,6 +37,11 @@ static int cld_dumped_to_killed(int code) {
         return code == CLD_DUMPED ? CLD_KILLED : code;
 }
 
+_unused_ static bool is_run_on_travis_ci(void) {
+        /* https://docs.travis-ci.com/user/environment-variables#default-environment-variables */
+        return streq_ptr(getenv("TRAVIS"), "true");
+}
+
 static void wait_for_service_finish(Manager *m, Unit *unit) {
         Service *service = NULL;
         usec_t ts;
diff --git a/src/test/test-helper.c b/src/test/test-helper.c
index dc8c80a14b..9e9de0132f 100644
--- a/src/test/test-helper.c
+++ b/src/test/test-helper.c
@@ -28,8 +28,3 @@ int enter_cgroup_subroot(void) {
 
         return cg_attach_everywhere(supported, cgroup_subroot, 0, NULL, NULL);
 }
-
-/* https://docs.travis-ci.com/user/environment-variables#default-environment-variables */
-bool is_run_on_travis_ci(void) {
-        return streq_ptr(getenv("TRAVIS"), "true");
-}
diff --git a/src/test/test-helper.h b/src/test/test-helper.h
index 81e19ee207..6e886ae3de 100644
--- a/src/test/test-helper.h
+++ b/src/test/test-helper.h
@@ -5,8 +5,6 @@
   Copyright © 2013 Holger Hans Peter Freyther
 ***/
 
-#include <stdbool.h>
-
 #include "sd-daemon.h"
 
 #define TEST_REQ_RUNNING_SYSTEMD(x)                                 \
@@ -17,5 +15,3 @@
         }
 
 int enter_cgroup_subroot(void);
-
-bool is_run_on_travis_ci(void);