diff --git a/src/HttpResponse.h b/src/HttpResponse.h
index 9c4b37082..8b46a24fc 100644
--- a/src/HttpResponse.h
+++ b/src/HttpResponse.h
@@ -314,7 +314,7 @@ struct HttpResponse : public AsyncSocket<SSL> {
 
                     /* If we are dedicated and have the 3kb then correct any 4kb to 3kb,
                      * (they both share the windowBits = 9) */
-                    if (webSocketContextData->compression & DEDICATED_COMPRESSOR_3KB) {
+                    if ((webSocketContextData->compression & CompressOptions::_COMPRESSOR_MASK) == DEDICATED_COMPRESSOR_3KB) {
                         compressOptions = DEDICATED_COMPRESSOR_3KB;
                     }
                 }