diff --git a/spring-cloud-config-client/src/main/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocator.java b/spring-cloud-config-client/src/main/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocator.java
index 48a074b0..37e55e8d 100644
--- a/spring-cloud-config-client/src/main/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocator.java
+++ b/spring-cloud-config-client/src/main/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocator.java
@@ -18,6 +18,7 @@ package org.springframework.cloud.config.client;
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -214,6 +215,7 @@ public class ConfigServicePropertySourceLocator implements PropertySourceLocator
 				if (StringUtils.hasText(state) && properties.isSendState()) {
 					headers.add(STATE_HEADER, state);
 				}
+				headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
 
 				final HttpEntity<Void> entity = new HttpEntity<>((Void) null, headers);
 				response = restTemplate.exchange(uri + path, HttpMethod.GET, entity,
diff --git a/spring-cloud-config-client/src/test/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocatorTests.java b/spring-cloud-config-client/src/test/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocatorTests.java
index 746a17fd..71843919 100644
--- a/spring-cloud-config-client/src/test/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocatorTests.java
+++ b/spring-cloud-config-client/src/test/java/org/springframework/cloud/config/client/ConfigServicePropertySourceLocatorTests.java
@@ -26,6 +26,7 @@ import org.hamcrest.core.IsInstanceOf;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
+import org.mockito.ArgumentCaptor;
 import org.mockito.Matchers;
 import org.mockito.Mockito;
 
@@ -50,6 +51,8 @@ import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.web.client.RestTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
 import static org.springframework.cloud.config.client.ConfigClientProperties.AUTHORIZATION;
 
 public class ConfigServicePropertySourceLocatorTests {
@@ -69,7 +72,18 @@ public class ConfigServicePropertySourceLocatorTests {
 		Environment body = new Environment("app", "master");
 		mockRequestResponseWithoutLabel(new ResponseEntity<>(body, HttpStatus.OK));
 		this.locator.setRestTemplate(this.restTemplate);
+
+		ArgumentCaptor<HttpEntity> argumentCaptor = ArgumentCaptor
+				.forClass(HttpEntity.class);
+
 		assertThat(this.locator.locate(this.environment)).isNotNull();
+
+		Mockito.verify(this.restTemplate).exchange(anyString(), any(HttpMethod.class),
+				argumentCaptor.capture(), any(Class.class), anyString(), anyString());
+
+		HttpEntity httpEntity = argumentCaptor.getValue();
+		assertThat(httpEntity.getHeaders().getAccept())
+				.containsExactly(MediaType.APPLICATION_JSON);
 	}
 
 	@Test
@@ -269,16 +283,15 @@ public class ConfigServicePropertySourceLocatorTests {
 	private void mockRequestResponseWithLabel(ResponseEntity<?> response, String label) {
 		Mockito.when(this.restTemplate.exchange(Mockito.any(String.class),
 				Mockito.any(HttpMethod.class), Mockito.any(HttpEntity.class),
-				Mockito.any(Class.class), Matchers.anyString(), Matchers.anyString(),
-				Matchers.eq(label))).thenReturn(response);
+				Mockito.any(Class.class), anyString(), anyString(), Matchers.eq(label)))
+				.thenReturn(response);
 	}
 
 	@SuppressWarnings("unchecked")
 	private void mockRequestResponseWithoutLabel(ResponseEntity<?> response) {
 		Mockito.when(this.restTemplate.exchange(Mockito.any(String.class),
 				Mockito.any(HttpMethod.class), Mockito.any(HttpEntity.class),
-				Mockito.any(Class.class), Matchers.anyString(), Matchers.anyString()))
-				.thenReturn(response);
+				Mockito.any(Class.class), anyString(), anyString())).thenReturn(response);
 	}
 
 	@SuppressWarnings("unchecked")
@@ -286,8 +299,8 @@ public class ConfigServicePropertySourceLocatorTests {
 			ResponseEntity<?> response, String expectedName) {
 		Mockito.when(this.restTemplate.exchange(Mockito.any(String.class),
 				Mockito.any(HttpMethod.class), Mockito.any(HttpEntity.class),
-				Mockito.any(Class.class), Matchers.eq(expectedName),
-				Matchers.anyString())).thenReturn(response);
+				Mockito.any(Class.class), Matchers.eq(expectedName), anyString()))
+				.thenReturn(response);
 	}
 
 }