diff --git a/ultrasonic/build.gradle b/ultrasonic/build.gradle
index f96e1089..bbc678d5 100644
--- a/ultrasonic/build.gradle
+++ b/ultrasonic/build.gradle
@@ -109,4 +109,5 @@ jacoco {
 
 tasks.withType(Test) {
     jacoco.includeNoLocationClasses = true
+    jacoco.excludes = ['jdk.internal.*']
 }