diff --git a/src/test/java/com/rolfje/anonimatron/anonymizer/DigitStringAnonymizerTest.java b/src/test/java/com/rolfje/anonimatron/anonymizer/DigitStringAnonymizerTest.java
index 96eebac..250140d 100644
--- a/src/test/java/com/rolfje/anonimatron/anonymizer/DigitStringAnonymizerTest.java
+++ b/src/test/java/com/rolfje/anonimatron/anonymizer/DigitStringAnonymizerTest.java
@@ -90,7 +90,8 @@ public void testMaskedDigitsPerformance() {
         }
 
         // On a 2013 MacBook this takes less than 200 ms.
-        boolean fastEnough = stopwatchNano.stop(500);
+        // On the Travis build server this takes roughly 750 ms.
+        boolean fastEnough = stopwatchNano.stop(1000);
         assertTrue(stopwatchNano.getMessage(), fastEnough);
     }