diff --git a/spring-web/src/main/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoder.java b/spring-web/src/main/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoder.java
index 820b3d08ba1..4acc85b67f6 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoder.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoder.java
@@ -60,7 +60,8 @@ public class ProtobufJsonEncoder implements HttpMessageEncoder<Message> {
 
 	private static final List<MimeType> defaultMimeTypes = List.of(
 			MediaType.APPLICATION_JSON,
-			new MediaType("application", "*+json"));
+			new MediaType("application", "*+json"),
+			MediaType.APPLICATION_NDJSON);
 
 	private final JsonFormat.Printer printer;
 
diff --git a/spring-web/src/test/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoderTests.java b/spring-web/src/test/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoderTests.java
index 477e8ba97d7..2924b0aa731 100644
--- a/spring-web/src/test/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoderTests.java
+++ b/spring-web/src/test/java/org/springframework/http/codec/protobuf/ProtobufJsonEncoderTests.java
@@ -64,7 +64,7 @@ class ProtobufJsonEncoderTests extends AbstractEncoderTests<ProtobufJsonEncoder>
 	protected void canEncode() throws Exception {
 		assertThat(this.encoder.canEncode(forClass(Msg.class), null)).isFalse();
 		assertThat(this.encoder.canEncode(forClass(Msg.class), MediaType.APPLICATION_JSON)).isTrue();
-		assertThat(this.encoder.canEncode(forClass(Msg.class), MediaType.APPLICATION_NDJSON)).isFalse();
+		assertThat(this.encoder.canEncode(forClass(Msg.class), MediaType.APPLICATION_NDJSON)).isTrue();
 		assertThat(this.encoder.canEncode(forClass(Object.class), MediaType.APPLICATION_JSON)).isFalse();
 	}