diff --git a/indra/newview/llviewertexturelist.h b/indra/newview/llviewertexturelist.h
index 813fda16478..075f6ae9158 100644
--- a/indra/newview/llviewertexturelist.h
+++ b/indra/newview/llviewertexturelist.h
@@ -229,8 +229,8 @@ class LLViewerTextureList
     bool mForceResetTextureStats;
 
     // to make "for (auto& imagep : gTextureList)" work
-    const image_list_t::iterator begin() const { return mImageList.begin(); }
-    const image_list_t::iterator end() const { return mImageList.end(); }
+    const image_list_t::const_iterator begin() const { return mImageList.cbegin(); }
+    const image_list_t::const_iterator end() const { return mImageList.cend(); }
 
 private:
     typedef std::map< LLTextureKey, LLPointer<LLViewerFetchedTexture> > uuid_map_t;