diff --git a/spring-boot-test/pom.xml b/spring-boot-test/pom.xml
index 782cb8c675..e99adc00c8 100644
--- a/spring-boot-test/pom.xml
+++ b/spring-boot-test/pom.xml
@@ -112,21 +112,11 @@
 			<optional>true</optional>
 		</dependency>
 		<!-- Test -->
-		<dependency>
-			<groupId>org.jetbrains.kotlin</groupId>
-			<artifactId>kotlin-runtime</artifactId>
-			<scope>test</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.apache.tomcat.embed</groupId>
 			<artifactId>tomcat-embed-core</artifactId>
 			<scope>test</scope>
 		</dependency>
-		<dependency>
-			<groupId>org.springframework</groupId>
-			<artifactId>spring-webmvc</artifactId>
-			<scope>test</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.codehaus.groovy</groupId>
 			<artifactId>groovy</artifactId>
@@ -138,6 +128,20 @@
 			<optional>true</optional>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.jetbrains.kotlin</groupId>
+			<artifactId>kotlin-runtime</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.spockframework</groupId>
+			<artifactId>spock-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-webmvc</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>
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 5e1087ed99..0b0000039b 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
@@ -214,6 +214,16 @@ class ImportsContextCustomizer implements ContextCustomizer {
 	 */
 	static class ContextCustomizerKey {
 
+		private static final Set<AnnotationFilter> ANNOTATION_FILTERS;
+
+		static {
+			Set<AnnotationFilter> filters = new HashSet<AnnotationFilter>();
+			filters.add(new JavaLangAnnotationFilter());
+			filters.add(new KotlinAnnotationFilter());
+			filters.add(new SpockAnnotationFilter());
+			ANNOTATION_FILTERS = Collections.unmodifiableSet(filters);
+		}
+
 		private final Set<Annotation> annotations;
 
 		ContextCustomizerKey(Class<?> testClass) {
@@ -239,8 +249,7 @@ class ImportsContextCustomizer implements ContextCustomizer {
 		private void collectElementAnnotations(AnnotatedElement element,
 				Set<Annotation> annotations, Set<Class<?>> seen) {
 			for (Annotation annotation : element.getDeclaredAnnotations()) {
-				if (!AnnotationUtils.isInJavaLangAnnotationPackage(annotation)
-						&& !isIgnoredKotlinAnnotation(annotation)) {
+				if (!isIgnoredAnnotation(annotation)) {
 					annotations.add(annotation);
 					collectClassAnnotations(annotation.annotationType(), annotations,
 							seen);
@@ -248,13 +257,13 @@ 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.");
+		private boolean isIgnoredAnnotation(Annotation annotation) {
+			for (AnnotationFilter annotationFilter : ANNOTATION_FILTERS) {
+				if (annotationFilter.isIgnored(annotation)) {
+					return true;
+				}
+			}
+			return false;
 		}
 
 		@Override
@@ -268,6 +277,46 @@ class ImportsContextCustomizer implements ContextCustomizer {
 					&& this.annotations.equals(((ContextCustomizerKey) obj).annotations));
 		}
 
+		private interface AnnotationFilter {
+
+			boolean isIgnored(Annotation annotation);
+
+		}
+
+		private static final class JavaLangAnnotationFilter implements AnnotationFilter {
+
+			@Override
+			public boolean isIgnored(Annotation annotation) {
+				return AnnotationUtils.isInJavaLangAnnotationPackage(annotation);
+			}
+
+		}
+
+		private static final class KotlinAnnotationFilter implements AnnotationFilter {
+
+			@Override
+			public boolean isIgnored(Annotation annotation) {
+				return "kotlin.Metadata".equals(annotation.annotationType().getName())
+						|| isInKotlinAnnotationPackage(annotation);
+			}
+
+			private boolean isInKotlinAnnotationPackage(Annotation annotation) {
+				return annotation.annotationType().getName()
+						.startsWith("kotlin.annotation.");
+			}
+
+		}
+
+		private static final class SpockAnnotationFilter implements AnnotationFilter {
+
+			@Override
+			public boolean isIgnored(Annotation annotation) {
+				return annotation.annotationType().getName()
+						.startsWith("org.spockframework.");
+			}
+
+		}
+
 	}
 
 }
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
index dea8eaef1a..aeec7702f6 100644
--- 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
@@ -18,6 +18,7 @@ package org.springframework.boot.test.context;
 
 import kotlin.Metadata;
 import org.junit.Test;
+import org.spockframework.runtime.model.SpecMetadata;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -35,6 +36,13 @@ public class ImportsContextCustomizerTests {
 						SecondKotlinAnnotatedTestClass.class));
 	}
 
+	@Test
+	public void customizersForTestClassesWithDifferentSpockMetadataAreEqual() {
+		assertThat(new ImportsContextCustomizer(FirstSpockAnnotatedTestClass.class))
+				.isEqualTo(new ImportsContextCustomizer(
+						SecondSpockAnnotatedTestClass.class));
+	}
+
 	@Metadata(d2 = "foo")
 	static class FirstKotlinAnnotatedTestClass {
 
@@ -45,4 +53,14 @@ public class ImportsContextCustomizerTests {
 
 	}
 
+	@SpecMetadata(filename = "foo", line = 10)
+	static class FirstSpockAnnotatedTestClass {
+
+	}
+
+	@SpecMetadata(filename = "bar", line = 10)
+	static class SecondSpockAnnotatedTestClass {
+
+	}
+
 }