diff --git a/build_tc.sh b/build_tc.sh
index f9d35ea..6808dad 100644
--- a/build_tc.sh
+++ b/build_tc.sh
@@ -27,7 +27,7 @@ function compile {
   if [ -f autogen.sh ]; then
     ./autogen.sh
   fi
-  CC=cl ./configure --prefix=$BUILD $2
+  CC=cl CFLAGS=$CFLAGS ./configure --prefix=$BUILD $2
   make -j $CPU_CORES
   make install
 }
@@ -38,9 +38,9 @@ if [ "$STEP" == "libmfx" ]; then
       autoreconf -fiv || exit 1
   fi
   if [ "$MODE" == "debug" ]; then
-    compile libmfx "--enable-debug --extra-cflags=$CFLAGS"
+    compile libmfx "--enable-debug"
   else
-    compile libmfx "--extra-cflags=$CFLAGS"
+    compile libmfx
   fi
   sed -i 's/-lstdc++/-ladvapi32/g' $BUILD/lib/pkgconfig/libmfx.pc
 elif [ "$STEP" == "opus" ]; then