diff --git a/spring-boot-test/pom.xml b/spring-boot-test/pom.xml
index ed3c3f10482..89ca82682a4 100644
--- a/spring-boot-test/pom.xml
+++ b/spring-boot-test/pom.xml
@@ -112,6 +112,12 @@
 			<optional>true</optional>
 		</dependency>
 		<!-- Test -->
+		<dependency>
+			<groupId>org.jetbrains.kotlin</groupId>
+			<artifactId>kotlin-runtime</artifactId>
+			<version>1.0.4</version>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.apache.tomcat.embed</groupId>
 			<artifactId>tomcat-embed-core</artifactId>
diff --git a/spring-boot-test/src/main/java/org/springframework/boot/test/context/ImportsContextCustomizer.java b/spring-boot-test/src/main/java/org/springframework/boot/test/context/ImportsContextCustomizer.java
index bed86e3ebd1..5e1087ed99b 100644
--- a/spring-boot-test/src/main/java/org/springframework/boot/test/context/ImportsContextCustomizer.java
+++ b/spring-boot-test/src/main/java/org/springframework/boot/test/context/ImportsContextCustomizer.java
@@ -207,10 +207,10 @@ class ImportsContextCustomizer implements ContextCustomizer {
 
 	/**
 	 * The key used to ensure correct application context caching. Keys are generated
-	 * based on <em>all</em> the annotations used with the test. We must use something
-	 * broader than just {@link Import @Import} annotations since an {@code @Import} may
-	 * use an {@link ImportSelector} which could make decisions based on anything
-	 * available from {@link AnnotationMetadata}.
+	 * based on <em>all</em> the annotations used with the test that aren't core Java or
+	 * Kotlin annotations. We must use something broader than just {@link Import @Import}
+	 * annotations since an {@code @Import} may use an {@link ImportSelector} which could
+	 * make decisions based on anything available from {@link AnnotationMetadata}.
 	 */
 	static class ContextCustomizerKey {
 
@@ -239,7 +239,8 @@ class ImportsContextCustomizer implements ContextCustomizer {
 		private void collectElementAnnotations(AnnotatedElement element,
 				Set<Annotation> annotations, Set<Class<?>> seen) {
 			for (Annotation annotation : element.getDeclaredAnnotations()) {
-				if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)) {
+				if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)
+						&& !isIgnoredKotlinAnnotation(annotation)) {
 					annotations.add(annotation);
 					collectClassAnnotations(annotation.annotationType(), annotations,
 							seen);
@@ -247,6 +248,15 @@ class ImportsContextCustomizer implements ContextCustomizer {
 			}
 		}
 
+		private boolean isIgnoredKotlinAnnotation(Annotation annotation) {
+			return "kotlin.Metadata".equals(annotation.annotationType().getName())
+					|| isInKotlinAnnotationPackage(annotation);
+		}
+
+		private boolean isInKotlinAnnotationPackage(Annotation annotation) {
+			return annotation.annotationType().getName().startsWith("kotlin.annotation.");
+		}
+
 		@Override
 		public int hashCode() {
 			return this.annotations.hashCode();
diff --git a/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerTests.java b/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerTests.java
new file mode 100644
index 00000000000..dea8eaef1a6
--- /dev/null
+++ b/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerTests.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.context;
+
+import kotlin.Metadata;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ImportsContextCustomizer}.
+ *
+ * @author Andy Wilkinson
+ */
+public class ImportsContextCustomizerTests {
+
+	@Test
+	public void customizersForTestClassesWithDifferentKotlinMetadataAreEqual() {
+		assertThat(new ImportsContextCustomizer(FirstKotlinAnnotatedTestClass.class))
+				.isEqualTo(new ImportsContextCustomizer(
+						SecondKotlinAnnotatedTestClass.class));
+	}
+
+	@Metadata(d2 = "foo")
+	static class FirstKotlinAnnotatedTestClass {
+
+	}
+
+	@Metadata(d2 = "bar")
+	static class SecondKotlinAnnotatedTestClass {
+
+	}
+
+}