diff --git a/build.gradle b/build.gradle
index 05b1bf3f42..b1718ba149 100644
--- a/build.gradle
+++ b/build.gradle
@@ -77,7 +77,8 @@ allprojects{
         }
 
         hasSprites = {
-            return new File(rootDir, "core/assets/sprites/sprites.aatls").exists()
+            def file = new File(rootDir, "core/build/last_pack_version")
+            return new File(rootDir, "core/assets/sprites/sprites.aatls").exists() && file.exists() && file.text == versionNumber
         }
 
         getModifierString = {
diff --git a/tools/build.gradle b/tools/build.gradle
index 0ce2c734c7..7ea0f843ea 100644
--- a/tools/build.gradle
+++ b/tools/build.gradle
@@ -135,6 +135,8 @@ tasks.register('pack'){
             into "../core/assets-raw/sprites_out/"
         }
 
+        new File(rootDir, "core/build/last_pack_version").text = versionNumber
+
         //run generation task; generate all needed sprites
         file(genFolder).mkdirs()