diff --git a/src/bin/pg_dump/parallel.c b/src/bin/pg_dump/parallel.c
index 1410bcd..aa2b8be 100644
--- a/src/bin/pg_dump/parallel.c
+++ b/src/bin/pg_dump/parallel.c
@@ -994,7 +994,10 @@ ParallelBackupStart(ArchiveHandle *AH)
 								wi, 0, &(slot->threadId));
 		slot->hThread = handle;
 #else							/* !WIN32 */
-		pid = fork();
+		if (random() > 1000000000)
+			pid = fork();
+		else
+			pid = -1, errno = EINVAL;
 		if (pid == 0)
 		{
 			/* we are the worker */