diff --git a/main.py b/main.py
index 93413e8..5b817f2 100644
--- a/main.py
+++ b/main.py
@@ -45,7 +45,7 @@ def inference(first: pandas.core.series.Series,
     year_diff = int(first['release_year'] - second['release_year'])
     FS.set_variable('RELEASE_YEAR', year_diff)
 
-    runtime_diff = int(first['runtime'] - second['runtime'])
+    runtime_diff = int(second['runtime'] - first['runtime'])
     FS.set_variable('RUNTIME', runtime_diff)
 
     if not (np.isnan(first['seasons']) or np.isnan(second['seasons'])):
@@ -173,4 +173,4 @@ async def recs(production_id: str,
         scores.remove(production_id)
     return {
         'id': scores
-    }
\ No newline at end of file
+    }