diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index 36cc1707bf..1085034276 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -1233,7 +1233,7 @@ spawn_process(const char *cmdline)
 		comspec = "CMD";
 
 	memset(&pi, 0, sizeof(pi));
-	cmdline2 = psprintf("\"%s\" /c \"%s\"", comspec, cmdline);
+	cmdline2 = psprintf("\"%s\" /d /c \"%s\"", comspec, cmdline);
 
 	if ((restrictedToken =
 		 CreateRestrictedProcess(cmdline2, &pi)) == 0)