diff --git a/test-tool/test_writesame10_0blocks.c b/test-tool/test_writesame10_0blocks.c
index cfbb064..2bc7270 100644
--- a/test-tool/test_writesame10_0blocks.c
+++ b/test-tool/test_writesame10_0blocks.c
@@ -53,7 +53,7 @@ test_writesame10_0blocks(void)
                 return;
         }
 
-        if (inq_bl->max_ws_len > 0 && num_blocks >= inq_bl->max_ws_len) {
+        if (inq_bl->max_ws_len > 0 && num_blocks > inq_bl->max_ws_len) {
             WRITESAME10(sd, 0, block_size, 0, 0, 0, 0, 0, scratch,
                         EXPECT_INVALID_FIELD_IN_CDB);
         } else {
diff --git a/test-tool/test_writesame16_0blocks.c b/test-tool/test_writesame16_0blocks.c
index adc56a5..90cc88b 100644
--- a/test-tool/test_writesame16_0blocks.c
+++ b/test-tool/test_writesame16_0blocks.c
@@ -48,7 +48,7 @@ test_writesame16_0blocks(void)
         }
 
 
-        if (inq_bl->max_ws_len > 0 && num_blocks >= inq_bl->max_ws_len) {
+        if (inq_bl->max_ws_len > 0 && num_blocks > inq_bl->max_ws_len) {
             WRITESAME16(sd, 0, block_size, 0, 0, 0, 0, 0, scratch,
                         EXPECT_INVALID_FIELD_IN_CDB);
         } else {