diff --git a/build.sh b/build.sh
index 249b9c7..bdb13b7 100755
--- a/build.sh
+++ b/build.sh
@@ -22,8 +22,8 @@ export PREFIX=$workDir/prefix
 export PKG_CONFIG_DIR=$PREFIX/lib/pkgconfig
 export PKG_CONFIG_PATH=$PKG_CONFIG_DIR
 
-#rm -rf $PREFIX
-#mkdir -p $PREFIX
+rm -rf $PREFIX
+mkdir -p $PREFIX
 
 mkdir -p $workDir
 mkdir -p $outDir
diff --git a/scripts/build-openh264.sh b/scripts/build-openh264.sh
index ba126ca..baf231d 100644
--- a/scripts/build-openh264.sh
+++ b/scripts/build-openh264.sh
@@ -18,7 +18,7 @@ cd $projectDir
 
 args="PREFIX=$PREFIX OS=$OPENH264_OS ARCH=$OPENH264_ARCH CC=$CC CXX=$CXX AR=$AR"
 
-# make clean
+make clean
 
 make -j$JOBS $args