diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7e68777b..dd661d3c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,7 +19,7 @@ jobs:
         run: |
           brew install scons mingw-w64 zlib
           curl -sLo cppunit.rb "https://sourceforge.net/p/nsis/code/HEAD/tree/web-scripts/trunk/cppunit.rb?format=raw"
-          brew install -s cppunit.rb
+          brew install -s --formula cppunit.rb
         if: startsWith(matrix.os, 'macos')
       - name: Apt Dependencies
         run: sudo DEBIAN_FRONTEND=noninteractive apt-get install -y scons g++-mingw-w64-i686 binutils-mingw-w64-i686 zlib1g-dev libcppunit-dev