diff --git a/tests/qtest/tdisp-test.c b/tests/qtest/tdisp-test.c
index 4138c0cec41de..133473effdf83 100644
--- a/tests/qtest/tdisp-test.c
+++ b/tests/qtest/tdisp-test.c
@@ -211,7 +211,7 @@ static libspdm_return_t tdisp_testdev_send_message(
         return LIBSPDM_STATUS_SEND_FAIL;
     }
 
-    for (size_t index; index < message_size / sizeof(uint32_t); ++index) {
+    for (size_t index = 0; index < message_size / sizeof(uint32_t); ++index) {
         qpcie_config_writel(&dev->dev, PCI_EXP_DOE + PCI_EXP_DOE_WR_DATA_MBOX,
                             data[index]);
     }