diff --git a/tools/rockboxdev.sh b/tools/rockboxdev.sh
index 34ecfce189..5f9d1acbac 100755
--- a/tools/rockboxdev.sh
+++ b/tools/rockboxdev.sh
@@ -211,7 +211,7 @@ build() {
             ./configure --prefix=$prefix $configure_params
         ;;
         *)
-            CFLAGS=-U_FORTIFY_SOURCE ../$toolname-$version/configure --target=$target --prefix=$prefix --enable-languages=c --disable-libssp --disable-docs $configure_params
+            CFLAGS='-U_FORTIFY_SOURCE -fgnu89-inline' ../$toolname-$version/configure --target=$target --prefix=$prefix --enable-languages=c --disable-libssp --disable-docs $configure_params
         ;;
     esac