diff --git a/content/base/src/nsContentList.cpp b/content/base/src/nsContentList.cpp
index a48d2a7aa82..86f1d0c8c75 100644
--- a/content/base/src/nsContentList.cpp
+++ b/content/base/src/nsContentList.cpp
@@ -518,7 +518,7 @@ nsContentList::Item(uint32_t aIndex, bool aDoFlush)
   }
 
   if (mState != LIST_UP_TO_DATE)
-    PopulateSelf(std::min(aIndex, UINT32_MAX - 1) + 1);
+    PopulateSelf(std::min(aIndex, uint32_t(UINT32_MAX - 1)) + 1);
 
   ASSERT_IN_SYNC;
   NS_ASSERTION(!mRootNode || mState != LIST_DIRTY,