diff --git a/radar-commons-testing/src/test/java/org/radarbase/util/OscilloscopeTest.java b/radar-commons-testing/src/test/java/org/radarbase/util/OscilloscopeTest.java
index 75a2e4db..3941f7de 100644
--- a/radar-commons-testing/src/test/java/org/radarbase/util/OscilloscopeTest.java
+++ b/radar-commons-testing/src/test/java/org/radarbase/util/OscilloscopeTest.java
@@ -38,7 +38,7 @@ public void beat() throws Exception {
                 // time of one beat is about 1/128 seconds = 7.8125 milliseconds
                 long beatDiff = System.currentTimeMillis() - time;
                 assertThat(beatDiff, greaterThanOrEqualTo(7L));
-                assertThat(beatDiff, lessThanOrEqualTo(13L));
+                assertThat(beatDiff, lessThanOrEqualTo(14L));
             }
         } while (!oscilloscope.willRestart());