diff --git a/matsim/src/main/java/org/matsim/core/population/routes/PopulationComparison.java b/matsim/src/main/java/org/matsim/core/population/routes/PopulationComparison.java
index cb98d6266ec..c6396a58f79 100644
--- a/matsim/src/main/java/org/matsim/core/population/routes/PopulationComparison.java
+++ b/matsim/src/main/java/org/matsim/core/population/routes/PopulationComparison.java
@@ -122,7 +122,7 @@ private static boolean isBothUndefinedOrWithinDelta(OptionalTime time1, Optional
         if (time1.isUndefined() ^ time2.isUndefined()) {
             return false;
         } else if(time1.isDefined()) {
-            return isWithinDelta(time1.seconds(), time2.seconds(), delta);
+            return isWithinDelta((int) time1.seconds(), (int) time2.seconds(), delta);
         }
         return true;
     }