diff --git a/src/lib/support/jsontlv/TlvJson.cpp b/src/lib/support/jsontlv/TlvJson.cpp
index 9e8d844420c83f..0cc84c33d7d80b 100644
--- a/src/lib/support/jsontlv/TlvJson.cpp
+++ b/src/lib/support/jsontlv/TlvJson.cpp
@@ -55,8 +55,8 @@ struct KeyContext
         key     = listIndex;
     }
 
-    KeyType keyType = kRoot;
-    uint32_t key    = 0;
+    KeyType keyType  = kRoot;
+    unsigned int key = 0;
 };
 } // namespace