diff --git a/deft4j-base/src/main/java/com/github/NeRdTheNed/deft4j/deflate/DeflateStream.java b/deft4j-base/src/main/java/com/github/NeRdTheNed/deft4j/deflate/DeflateStream.java
index 38fa0cc..1b6224a 100644
--- a/deft4j-base/src/main/java/com/github/NeRdTheNed/deft4j/deflate/DeflateStream.java
+++ b/deft4j-base/src/main/java/com/github/NeRdTheNed/deft4j/deflate/DeflateStream.java
@@ -558,7 +558,13 @@ public long optimise() {
         // TODO Try other types of blocks
         // TODO Try merging more block types
         // TODO Try merging blocks at different passes
-        saved += mergeBlocks();
+        final long mergeSaved = mergeBlocks();
+        saved += mergeSaved;
+
+        if (mergeSaved > 0) {
+            return saved + optimise();
+        }
+
         return saved;
     }