diff --git a/tools/x-win/package.sh b/tools/x-win/package.sh
index 092b639a3e..d1366e3635 100755
--- a/tools/x-win/package.sh
+++ b/tools/x-win/package.sh
@@ -33,7 +33,7 @@ if test -n "$MIXBUS"; then
 fi
 
 # derived variables
-PRODUCT_ID=${PRODUCT_NAME}${PROGRAM_VERSION}
+PRODUCT_ID=${PROGRAM_NAME}${PROGRAM_VERSION}
 PRODUCT_EXE=${PRODUCT_NAME}.exe
 PRODUCT_ICON=${PRODUCT_NAME}.ico