diff --git a/galasa-extensions-parent/dev.galasa.extensions.mocks/src/main/java/dev/galasa/extensions/mocks/MockTimeService.java b/galasa-extensions-parent/dev.galasa.extensions.mocks/src/main/java/dev/galasa/extensions/mocks/MockTimeService.java
index eadad615..2171709f 100644
--- a/galasa-extensions-parent/dev.galasa.extensions.mocks/src/main/java/dev/galasa/extensions/mocks/MockTimeService.java
+++ b/galasa-extensions-parent/dev.galasa.extensions.mocks/src/main/java/dev/galasa/extensions/mocks/MockTimeService.java
@@ -25,4 +25,10 @@ public Instant now() {
     public void setCurrentTime(Instant currentTime) {
         this.currentTime = currentTime;
     }
+
+    @Override
+    public void sleepMillis(long millisToSleep) throws InterruptedException {
+        // Pretend we are sleeping, so the current time advances.
+        setCurrentTime(currentTime.plusMillis(millisToSleep));
+    }
 }