diff --git a/.github/workflows/cmake_build.yml b/.github/workflows/cmake_build.yml
index 9a9431de9..70d6d101b 100644
--- a/.github/workflows/cmake_build.yml
+++ b/.github/workflows/cmake_build.yml
@@ -23,6 +23,10 @@ env:
   WXURL: https://github.com/audacity/wxWidgets
   WXREF: audacity-fixes-3.1.3
   WXWIN: ${{ github.workspace }}/wxwin
+  # As of 2021/01/01, github is using Xcode 12.2 as the default and
+  # it has a bug in the install_name_tool.  So explicity use 12.3
+  # instead.
+  DEVELOPER_DIR: /Applications/Xcode_12.3.app/Contents/Developer
 
 #
 # Define our job(s)