diff --git a/frigate/api/review.py b/frigate/api/review.py
index 76619dcb2..f72c0efc3 100644
--- a/frigate/api/review.py
+++ b/frigate/api/review.py
@@ -660,7 +660,7 @@ def motion_activity(
             df.iloc[i : i + chunk, 0] = 0.0
 
     # change types for output
-    df.index = df.index.astype(int) // (10**9)
+    df.index = df.index.as_unit("s").astype("int64")
     normalized = df.reset_index().to_dict("records")
     return JSONResponse(content=normalized)