diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index f7c0f3c9..4877f1c8 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -28,7 +28,7 @@ jobs:
       run:   choco install mingw --no-progress
     - name: make
       shell: bash
-      run: mingw32-make CC="gcc -std=c11"
+      run: mingw32-make CC="gcc -std=c99 -D__USE_MINGW_ANSI_STDIO=1"
     - name: make check
       shell: bash
-      run: mingw32-make CC="gcc -std=c11" check
+      run: mingw32-make CC="gcc -std=c99 -D__USE_MINGW_ANSI_STDIO=1" check