diff --git a/test-tool/0191_writesame16_unmap_unaligned.c b/test-tool/0191_writesame16_unmap_unaligned.c
index 1999637..da30eab 100644
--- a/test-tool/0191_writesame16_unmap_unaligned.c
+++ b/test-tool/0191_writesame16_unmap_unaligned.c
@@ -77,7 +77,7 @@ int T0191_writesame16_unmap_unaligned(const char *initiator, const char *url, in
 
 	if (lbppb < 2) {
 		printf("LBPPB==%d  Can not unmap fractional physical block\n", lbppb);
-		ret = -1;
+		ret = -2;
 		goto finished;
 	}