diff --git a/kwin/build.sh b/kwin/build.sh
index 78b5947..33d43e5 100755
--- a/kwin/build.sh
+++ b/kwin/build.sh
@@ -38,14 +38,24 @@ for file in ../po/*.po; do
   msgfmt "$file" -o "$BUILD_DIR/locale/$lang/LC_MESSAGES/burn-my-windows.mo"
 done
 
-# This method is called one for each effect. The parameters are as follows:
+# This method is called once for each effect. The parameters are as follows:
 # $1: The nick of the effect (e.g. "energize-a")
 # $2: The name of the effect (e.g. "Energize A")
 # $3: A short description of the effect (e.g. "Beam your windows away")
 generate() {
+  generate_impl "$1" "$2" "$3" "kwin5"
+  generate_impl "$1" "$2" "$3" "kwin6"
+}
+
+# This method is called twice for each effect. The parameters are as follows:
+# $1: The nick of the effect (e.g. "energize-a")
+# $2: The name of the effect (e.g. "Energize A")
+# $3: A short description of the effect (e.g. "Beam your windows away")
+# #4: Either "kwin5" or "kwin6".
+generate_impl() {
 
   # We use the nick for the effect's directory name by replacing dashes with underscoares.
-  DIR_NAME="kwin4_effect_$(echo "$1" | tr '-' '_')"
+  DIR_NAME="${4}_effect_$(echo "$1" | tr '-' '_')"
 
   # We transform the nick to CamelCase for the JavaScript class name.
   EFFECT_CLASS="BurnMyWindows$(sed -r 's/(^|-)(\w)/\U\2/g' <<<"$1")Effect"
@@ -106,6 +116,11 @@ generate() {
   {
     echo "#version 140"
     echo "#define KWIN"
+
+    if [ "$4" == "kwin6" ]; then
+      echo "#define PLASMA6"
+    fi
+
     echo ""
     echo "// This file is automatically generated during the build process."
     echo ""
@@ -115,6 +130,11 @@ generate() {
 
   {
     echo "#define KWIN_LEGACY"
+
+    if [ "$4" == "kwin6" ]; then
+      echo "#define PLASMA6"
+    fi
+
     echo ""
     echo "// This file is automatically generated during the build process."
     echo ""
@@ -153,4 +173,5 @@ generate "wisps"       "Wisps [Burn-My-Windows]"       "Let your windows be carr
 
 # Finally, create an archive for the effects.
 # shellcheck disable=SC2046
-tar -czf "burn_my_windows_kwin4.tar.gz" -C "$BUILD_DIR" $(ls "$BUILD_DIR")
+tar -czf "burn_my_windows_kwin5.tar.gz" -C "$BUILD_DIR" $(ls "$BUILD_DIR" | grep kwin5)
+tar -czf "burn_my_windows_kwin6.tar.gz" -C "$BUILD_DIR" $(ls "$BUILD_DIR" | grep kwin6)