diff --git a/Telegram/PrepareMac.sh b/Telegram/PrepareMac.sh
index f8260595d..df3b18afa 100755
--- a/Telegram/PrepareMac.sh
+++ b/Telegram/PrepareMac.sh
@@ -16,6 +16,11 @@ if [ ! -d "./../Mac/Release/Telegram.app" ]; then
   exit 1
 fi
 
+if [ ! -d "./../Mac/Release/Telegram.app/Contents/_CodeSignature" ]; then
+  echo "Telegram signature not found!"
+  exit 1
+fi
+
 if [ ! -f "./../Mac/Release/Telegram.app/Contents/Resources/Icon.icns" ]; then
   echo "Icon.icns not found in Resources!"
   exit 1
diff --git a/Telegram/SignMac.sh b/Telegram/SignMac.sh
index f0bc97157..547e47940 100755
--- a/Telegram/SignMac.sh
+++ b/Telegram/SignMac.sh
@@ -1 +1 @@
-codesign --force --sign "Developer ID Application: John Preston" ./../Mac/Release/Telegram.app
+codesign --force --deep --sign "Developer ID Application: John Preston" ./../Mac/Release/Telegram.app