diff --git a/codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameWriter.java b/codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameWriter.java
index 5a5a371a1f..998bc2816a 100644
--- a/codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameWriter.java
+++ b/codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2FrameWriter.java
@@ -86,7 +86,7 @@ public class DefaultHttp2FrameWriter implements Http2FrameWriter, Http2FrameSize
     @Override
     public void maxFrameSize(int max) throws Http2Exception {
         if (!isMaxFrameSizeValid(max)) {
-            connectionError(FRAME_SIZE_ERROR, "Invalid MAX_FRAME_SIZE specified in sent settings: %d", max);
+            throw connectionError(FRAME_SIZE_ERROR, "Invalid MAX_FRAME_SIZE specified in sent settings: %d", max);
         }
         maxFrameSize = max;
     }