diff --git a/run-tests.php b/run-tests.php
index 4f3b42b5660..d0e6df38bf8 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -1380,7 +1380,7 @@ TEST $file
 	}
 
 	if ($leak_check) {
-		$cmd = "valgrind -q --tool=memcheck --log-file-exactly=$memcheck_filename $cmd";
+		$cmd = "valgrind -q --tool=memcheck --trace-children=yes --log-file-exactly=$memcheck_filename $cmd";
 	}
 
 	if ($DETAILED) echo "