diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6cfd4db..375b8dd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -48,17 +48,18 @@ jobs:
         with:
           repository: lnis-uofu/OpenFPGA
           path: OpenFPGA
+          submodules: true
 
       - name: Install dependency
-        run: source ./.github/workflows/install_dependency.sh 
+        run: source ./.github/workflows/install_dependency.sh
 
       - name: Checkout CMake version
-        run: cmake --version 
+        run: cmake --version
 
       - name: Checkout iVerilog version
         run: |
-          iverilog -V 
-          vvp -V 
+          iverilog -V
+          vvp -V
 
       - name: Create CMake build environment
         # Some projects don't allow in-source building, so create a separate build directory
@@ -70,8 +71,8 @@ jobs:
         # access regardless of the host operating system
         shell: bash
         working-directory: ${{runner.workspace}}/OpenFPGA/build
-        # Note the current convention is to use the -S and -B options here to specify source 
-        # and build directories, but this is only available with CMake 3.13 and higher.  
+        # Note the current convention is to use the -S and -B options here to specify source
+        # and build directories, but this is only available with CMake 3.13 and higher.
         # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
         run: |
           export CC=${{ matrix.config.cc }}
@@ -83,10 +84,10 @@ jobs:
         shell: bash
         # Execute the build.  You can specify a specific target with "--target <NAME>"
         run: |
-          cmake --build . --config $BUILD_TYPE 
+          cmake --build . --config $BUILD_TYPE
 
       - name: ${{matrix.config.name}}
         if: contains(matrix.config.name, 'Quick Test')
         shell: bash
-        # Execute the test. 
+        # Execute the test.
         run: source ./.github/workflows/${{matrix.config.reg_script}}