diff --git a/docker-builder-data/build/script/packet/opentoonz-master.sh b/docker-builder-data/build/script/packet/opentoonz-master.sh
index 500a3c7..07ae132 100644
--- a/docker-builder-data/build/script/packet/opentoonz-master.sh
+++ b/docker-builder-data/build/script/packet/opentoonz-master.sh
@@ -14,10 +14,10 @@ if [ "$PLATFORM" = "linux" ]; then
 fi
 
 pkhook_version() {
-    cat "$PK_DIRNAME/toonz/sources/toonz/main.cpp" \
-    | grep "const.char.\*applicationFullName.=.\"OpenToonz." \
-    | cut -d \" -f 2 \
-    | cut -d " " -f 2 \
+    local LOCAL_FILENAME="$PK_DIRNAME/toonz/sources/include/tversion.h"
+    LANG=C LC_NUMERIC=C printf "%0.1f.%g\\n" \
+      `cat "$LOCAL_FILENAME" | grep applicationVersion -m1 | cut -d "=" -f 2 | cut -d ";" -f 1` \
+      `cat "$LOCAL_FILENAME" | grep applicationRevision -m1 | cut -d "=" -f 2 | cut -d ";" -f 1` \
     || return 1
 }