diff --git a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/main/java/org/springframework/cloud/function/adapter/gcp/FunctionInvoker.java b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/main/java/org/springframework/cloud/function/adapter/gcp/FunctionInvoker.java
index c921291de..062787d84 100644
--- a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/main/java/org/springframework/cloud/function/adapter/gcp/FunctionInvoker.java
+++ b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/main/java/org/springframework/cloud/function/adapter/gcp/FunctionInvoker.java
@@ -121,6 +121,7 @@ public class FunctionInvoker implements HttpFunction, RawBackgroundFunction {
 
 		if (result != null) {
 			MessageHeaders headers = result.getHeaders();
+			httpResponse.setContentType(result.getHeaders().get(MessageHeaders.CONTENT_TYPE).toString());
 			httpResponse.getWriter().write(new String(result.getPayload(), StandardCharsets.UTF_8));
 			for (Entry<String, Object> header : headers.entrySet()) {
 				Object values = header.getValue();
diff --git a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerHttpTests.java b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerHttpTests.java
index eff309bfb..c178414ae 100644
--- a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerHttpTests.java
+++ b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerHttpTests.java
@@ -89,6 +89,7 @@ public class FunctionInvokerHttpTests {
 
 	}
 
+
 	@Test
 	public void testJsonInputFunction() throws Exception {
 
@@ -103,8 +104,22 @@ public class FunctionInvokerHttpTests {
 
 
 		assertThat(writer.toString()).isEqualTo(gson.toJson(expectedOutput));
+	}
+
+	@Test
+	public void testWithKanji() throws Exception {
+
+		FunctionInvoker handler = new FunctionInvoker(JsonInputFunction.class);
+
+		String expectedOutput = "Thank you for sending the message: 森林";
+		IncomingRequest input = new IncomingRequest("森林");
+
+		when(request.getReader()).thenReturn(new BufferedReader(new StringReader(gson.toJson(input))));
+		handler.service(request, response);
+		bufferedWriter.close();
 
 
+		assertThat(writer.toString()).isEqualTo(gson.toJson(expectedOutput));
 	}
 
 	@Test