diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 491f3b5..e6e3a72 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -34,7 +34,7 @@ jobs:
       run: copy Makefile.win Makefile
     - name: dir Windows
       if: ${{ startsWith(matrix.target, 'windows') }}
-      run: cmd /C 'echo LIBS := -L "c:/program files/openssl/lib" $(LIBS) >>Makefile.win && type Makefile.win'
+      run: cmd /C 'echo LIBS := -L "c:/program files/openssl/lib" $(LIBS) >>Makefile.win && echo CFLAGS := -I "c:/program files/openssl/include" $(CFLAGS) >>Makefile.win && type Makefile.win'
     - name: make
 #      if: ${{ !startsWith(matrix.target, 'windows') }}
       run: make