diff --git a/src/cli/cli_tcat.cpp b/src/cli/cli_tcat.cpp
index d036b37d5f50..3e694e41ea63 100644
--- a/src/cli/cli_tcat.cpp
+++ b/src/cli/cli_tcat.cpp
@@ -99,7 +99,7 @@ static bool IsDeviceIdSet(void)
 {
     bool ret = false;
 
-    for (otTcatAdvertisedDeviceId &vendorDeviceId : sAdvertisedDeviceIds)
+    for (const otTcatAdvertisedDeviceId &vendorDeviceId : sAdvertisedDeviceIds)
     {
         VerifyOrExit(vendorDeviceId.mDeviceIdType == OT_TCAT_DEVICE_ID_EMPTY, ret = true);
     }