diff --git a/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/resource/ResourceControllerTests.java b/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/resource/ResourceControllerTests.java
index acd08695..00565416 100644
--- a/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/resource/ResourceControllerTests.java
+++ b/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/resource/ResourceControllerTests.java
@@ -175,6 +175,13 @@ public class ResourceControllerTests {
 		assertThat(resource).isEqualToIgnoringNewLines("foo: dev_bar/spam");
 	}
 
+	@Test
+	public void resourceWithoutFileExtension() throws Exception {
+		this.environmentRepository.setSearchLocations("classpath:/test");
+		String resource = this.controller.retrieve("foo", "bar", "dev", "foo", true);
+		assertThat(resource).isEqualToIgnoringNewLines("foo: dev_bar");
+	}
+
 	@Test
 	public void resourceWithSlash() throws Exception {
 		this.environmentRepository.setSearchLocations("classpath:/test");
diff --git a/spring-cloud-config-server/src/test/resources/test/dev/foo b/spring-cloud-config-server/src/test/resources/test/dev/foo
new file mode 100644
index 00000000..be18679f
--- /dev/null
+++ b/spring-cloud-config-server/src/test/resources/test/dev/foo
@@ -0,0 +1 @@
+foo: dev_bar