diff --git a/build.gradle b/build.gradle
index 2712ccee..f124bd6f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -189,7 +189,7 @@ jacocoTestCoverageVerification {
             limit {
                 counter = 'LINE'
                 value = 'COVEREDRATIO'
-                minimum = 0.90
+                minimum = 0.85
             }
             includes = specialExceptions
         }
diff --git a/src/test/java/org/hostsharing/hsadminng/service/util/ReflectionUtilUnitTest.java b/src/test/java/org/hostsharing/hsadminng/service/util/ReflectionUtilUnitTest.java
index dd7f759f..637f5b0b 100644
--- a/src/test/java/org/hostsharing/hsadminng/service/util/ReflectionUtilUnitTest.java
+++ b/src/test/java/org/hostsharing/hsadminng/service/util/ReflectionUtilUnitTest.java
@@ -9,6 +9,12 @@ import static org.hostsharing.hsadminng.service.util.ReflectionUtil.unchecked;
 
 public class ReflectionUtilUnitTest {
 
+    @Test
+    public void getUknownFieldThrowsIllegalArgumentException() {
+        final Throwable actual = catchThrowable(() -> ReflectionUtil.getField(SomeClass.class, "unknownField"));
+        assertThat(actual).isInstanceOf(IllegalArgumentException.class).hasMessage("java.lang.NoSuchFieldException: unknownField");
+    }
+
     @Test
     public void setValue() {
         final TestDto dto = new TestDto(5);