diff --git a/.github/workflows/ios.yml b/.github/workflows/ios.yml
index d4a00a58..3debef90 100644
--- a/.github/workflows/ios.yml
+++ b/.github/workflows/ios.yml
@@ -70,7 +70,7 @@ jobs:
           cd ../..
 
       - name: Install system dependencies
-        run: brew install doxygen sphinx-doc graphviz
+        run: brew install doxygen sphinx-doc graphviz autoconf
 
       - name: Configure CMake
         # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.