diff --git a/src/main/java/ca/joeltherrien/randomforest/DataLoader.java b/src/main/java/ca/joeltherrien/randomforest/DataLoader.java
index 09d5e96..0d999cb 100644
--- a/src/main/java/ca/joeltherrien/randomforest/DataLoader.java
+++ b/src/main/java/ca/joeltherrien/randomforest/DataLoader.java
@@ -66,7 +66,7 @@ public class DataLoader {
         final List<Tree<O>> treeList = new ArrayList<>(treeFileList.size());
 
         for(final File treeFile : treeFileList){
-            final ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream(treeFile));
+            final ObjectInputStream inputStream = new ObjectInputStream(new GZIPInputStream(new FileInputStream(treeFile)));
 
             final Tree<O> tree = (Tree) inputStream.readObject();
 
diff --git a/src/main/java/ca/joeltherrien/randomforest/tree/ForestTrainer.java b/src/main/java/ca/joeltherrien/randomforest/tree/ForestTrainer.java
index fcdd111..7896519 100644
--- a/src/main/java/ca/joeltherrien/randomforest/tree/ForestTrainer.java
+++ b/src/main/java/ca/joeltherrien/randomforest/tree/ForestTrainer.java
@@ -18,6 +18,7 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
+import java.util.zip.GZIPOutputStream;
 
 @Builder
 @AllArgsConstructor(access=AccessLevel.PRIVATE)
@@ -163,7 +164,7 @@ public class ForestTrainer<Y, TO, FO> {
     public void saveTree(final Tree<TO> tree, String name) throws IOException {
         final String filename = saveTreeLocation + "/" + name;
 
-        final ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream(filename));
+        final ObjectOutputStream outputStream = new ObjectOutputStream(new GZIPOutputStream(new FileOutputStream(filename)));
 
         outputStream.writeObject(tree);