diff --git a/kwin/build.sh b/kwin/build.sh
index 14fce0b..190c0dd 100755
--- a/kwin/build.sh
+++ b/kwin/build.sh
@@ -40,14 +40,15 @@ generate() {
   sed -e "s;%NICK%;$1;g" -e "s;%NAME%;$2;g" -e "s;%DESCRIPTION%;$3;g" \
     main.js.in > "${BUILD_DIR}/kwin4_effect_$1/contents/code/main.js"
 
-  SHADER="${BUILD_DIR}/kwin4_effect_$1/contents/shaders/$1.frag"
-  echo "#version 140"                                                      >  "$SHADER"
-  echo "#define KWIN"                                                      >> "$SHADER"
-  echo ""                                                                  >> "$SHADER"
-  echo "// This file is automatically generated during the build process." >> "$SHADER"
-  echo ""                                                                  >> "$SHADER"
-  cat "../resources/shaders/common.glsl"                                   >> "$SHADER"
-  cat "../resources/shaders/$1.frag"                                       >> "$SHADER"
+  {
+    echo "#version 140"
+    echo "#define KWIN"
+    echo ""
+    echo "// This file is automatically generated during the build process."
+    echo ""
+    cat "../resources/shaders/common.glsl"
+    cat "../resources/shaders/$1.frag"
+  } > "${BUILD_DIR}/kwin4_effect_$1/contents/shaders/$1.frag"
 }
 
 generate "tv" "TV Effect" "Make windows close like turning off a TV"