diff --git a/scripts/json_add_image_info.py b/scripts/json_add_image_info.py
index 23033f9fc4..4608996f02 100755
--- a/scripts/json_add_image_info.py
+++ b/scripts/json_add_image_info.py
@@ -44,7 +44,7 @@ file_info = {
     "target": "{}/{}".format(getenv("TARGET"), getenv("SUBTARGET")),
     "version_code": getenv("VERSION_CODE"),
     "version_number": getenv("VERSION_NUMBER"),
-    "source_date_epoch": getenv("SOURCE_DATE_EPOCH"),
+    "source_date_epoch": int(getenv("SOURCE_DATE_EPOCH")),
     "profiles": {
         device_id: {
             "image_prefix": getenv("DEVICE_IMG_PREFIX"),