diff --git a/subprojects/gst-devtools/validate/launcher/apps/gstcheck.py b/subprojects/gst-devtools/validate/launcher/apps/gstcheck.py
index 0d80994961..cff50890d7 100644
--- a/subprojects/gst-devtools/validate/launcher/apps/gstcheck.py
+++ b/subprojects/gst-devtools/validate/launcher/apps/gstcheck.py
@@ -352,7 +352,7 @@ class GstCheckTestsManager(MesonTestsManager):
         arggroup.add_argument("--gst-check-leak-trace-testnames",
                               default=None,
                               help="A regex to specifying testsnames of the test"
-                              "to run with the leak tracer activated, if 'known-not-leaky'"
+                              " to run with the leak tracer activated, if 'known-not-leaky'"
                               " is specified, the testsuite will automatically activate"
                               " leak tracers on tests known to be not leaky.")
         arggroup.add_argument("--gst-check-leak-options",