diff --git a/src/main/java/org/elasticsearch/common/compress/CompressedString.java b/src/main/java/org/elasticsearch/common/compress/CompressedString.java
index 784c57c527e..aca1d45f86d 100644
--- a/src/main/java/org/elasticsearch/common/compress/CompressedString.java
+++ b/src/main/java/org/elasticsearch/common/compress/CompressedString.java
@@ -47,7 +47,7 @@ public final class CompressedString {
         } else {
             BytesArray bytesArray = data.toBytesArray();
             this.bytes = CompressorFactory.defaultCompressor().compress(bytesArray.array(), bytesArray.arrayOffset(), bytesArray.length());
-            assert CompressorFactory.compressor(bytes) == CompressorFactory.defaultCompressor();
+            assert CompressorFactory.compressor(bytes) != null;
         }
 
     }