diff --git a/Telegram/SourceFiles/ui/images.h b/Telegram/SourceFiles/ui/images.h
index 9bd98067a..f40b88fe6 100644
--- a/Telegram/SourceFiles/ui/images.h
+++ b/Telegram/SourceFiles/ui/images.h
@@ -390,7 +390,7 @@ protected:
 	virtual void setInformation(int32 size, int32 width, int32 height) = 0;
 	virtual FileLoader *createLoader(LoadFromCloudSetting fromCloud, bool autoLoading) = 0;
 
-	void checkload() const {
+	void checkload() const override {
 		doCheckload();
 	}
 	void loadLocal();
@@ -462,10 +462,10 @@ public:
 
 	void setStorageLocation(const StorageImageLocation location);
 
-	virtual DelayedStorageImage *toDelayedStorageImage() {
+	virtual DelayedStorageImage *toDelayedStorageImage() override {
 		return this;
 	}
-	virtual const DelayedStorageImage *toDelayedStorageImage() const {
+	virtual const DelayedStorageImage *toDelayedStorageImage() const override {
 		return this;
 	}
 
diff --git a/Telegram/gyp/settings_mac.gypi b/Telegram/gyp/settings_mac.gypi
index c572c543a..75e9cf1cc 100644
--- a/Telegram/gyp/settings_mac.gypi
+++ b/Telegram/gyp/settings_mac.gypi
@@ -61,6 +61,7 @@
         'COPY_PHASE_STRIP': 'NO',
         'CLANG_CXX_LANGUAGE_STANDARD': 'c++1z',
         'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES',
+        'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',
       },
       'configurations': {
         'Debug': {