diff --git a/dom/indexedDB/AsyncConnectionHelper.cpp b/dom/indexedDB/AsyncConnectionHelper.cpp
index b86e519ec23..f4e4ace6623 100644
--- a/dom/indexedDB/AsyncConnectionHelper.cpp
+++ b/dom/indexedDB/AsyncConnectionHelper.cpp
@@ -94,7 +94,7 @@ ConvertCloneReadInfosToArrayInternal(
       return NS_ERROR_DOM_INDEXEDDB_UNKNOWN_ERR;
     }
 
-    for (uint32 index = 0, count = aReadInfos.Length(); index < count;
+    for (uint32_t index = 0, count = aReadInfos.Length(); index < count;
          index++) {
       StructuredCloneReadInfo& readInfo = aReadInfos[index];
 
diff --git a/dom/indexedDB/IDBObjectStore.cpp b/dom/indexedDB/IDBObjectStore.cpp
index 3ded781c39e..6475376ed06 100644
--- a/dom/indexedDB/IDBObjectStore.cpp
+++ b/dom/indexedDB/IDBObjectStore.cpp
@@ -943,8 +943,8 @@ StructuredCloneReadString(JSStructuredCloneReader* aReader,
 JSObject*
 IDBObjectStore::StructuredCloneReadCallback(JSContext* aCx,
                                             JSStructuredCloneReader* aReader,
-                                            uint32 aTag,
-                                            uint32 aData,
+                                            uint32_t aTag,
+                                            uint32_t aData,
                                             void* aClosure)
 {
   if (aTag == SCTAG_DOM_BLOB || aTag == SCTAG_DOM_FILE) {
diff --git a/dom/indexedDB/IDBObjectStore.h b/dom/indexedDB/IDBObjectStore.h
index 798c9b3e720..f36f18e56dd 100644
--- a/dom/indexedDB/IDBObjectStore.h
+++ b/dom/indexedDB/IDBObjectStore.h
@@ -118,8 +118,8 @@ public:
   static JSObject*
   StructuredCloneReadCallback(JSContext* aCx,
                               JSStructuredCloneReader* aReader,
-                              uint32 aTag,
-                              uint32 aData,
+                              uint32_t aTag,
+                              uint32_t aData,
                               void* aClosure);
   static JSBool
   StructuredCloneWriteCallback(JSContext* aCx,