diff --git a/support/testing/run-tests b/support/testing/run-tests
index 2f670c03b8..1c4d2b4a85 100755
--- a/support/testing/run-tests
+++ b/support/testing/run-tests
@@ -142,4 +142,5 @@ def main():
 
 
 if __name__ == "__main__":
+    multiprocessing.set_start_method("fork")
     sys.exit(main())