diff --git a/.github/workflows/clang-ast.yaml b/.github/workflows/clang-ast.yaml
index 406477427..2f53e823d 100644
--- a/.github/workflows/clang-ast.yaml
+++ b/.github/workflows/clang-ast.yaml
@@ -41,16 +41,11 @@ jobs:
           make
 
       - name: Configure Unit
-        run: ./configure --cc=clang --openssl --debug --tests
+        run: ./configure --cc=clang --openssl --debug --tests \
+             --cc-opt="-Xclang -load -Xclang clang-ast/ngx-ast.so -Xclang -add-plugin -Xclang ngx-ast"
 
       - name: Build Unit
-        run: |
-          make -j4 \
-            EXTRA_CFLAGS="-Xclang -load -Xclang clang-ast/ngx-ast.so -Xclang -add-plugin -Xclang ngx-ast" \
-            NXT_SHARED_LOCAL_LINK=: build/lib/libnxt.so
+        run: make -j4 NXT_SHARED_LOCAL_LINK=: build/lib/libnxt.so
 
       - name: Build C tests
-        run: |
-          make -j4 \
-            EXTRA_CFLAGS="-Xclang -load -Xclang clang-ast/ngx-ast.so -Xclang -add-plugin -Xclang ngx-ast" \
-            tests
+        run: make -j4 tests