diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index db2997aaac..44a619226e 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -826,8 +826,8 @@ jobs:
             ldflags=''
             if [ "${MATRIX_PLAT}" = 'uwp' ]; then
               options+=' -DCMAKE_SYSTEM_NAME=WindowsStore -DCMAKE_SYSTEM_VERSION=10.0'
-              cflags='-DWINAPI_FAMILY=WINAPI_FAMILY_PC_APP'
-              ldflags='-OPT:NOREF -OPT:NOICF -APPCONTAINER:NO'
+              cflags+=' -DWINAPI_FAMILY=WINAPI_FAMILY_PC_APP'
+              ldflags+=' -OPT:NOREF -OPT:NOICF -APPCONTAINER:NO'
               vsglobals=';AppxPackage=false;WindowsAppContainer=false'
             fi
             if [ "${TFLAGS}" = 'skiprun' ]; then