diff --git a/src/main/java/org/kohsuke/github/GHTreeBuilder.java b/src/main/java/org/kohsuke/github/GHTreeBuilder.java
index 0439c808c3..1a5657686d 100644
--- a/src/main/java/org/kohsuke/github/GHTreeBuilder.java
+++ b/src/main/java/org/kohsuke/github/GHTreeBuilder.java
@@ -1,5 +1,7 @@
 package org.kohsuke.github;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonInclude.Include;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 
 import java.io.IOException;
@@ -16,8 +18,10 @@ public class GHTreeBuilder {
 
     private final List<TreeEntry> treeEntries = new ArrayList<TreeEntry>();
 
+    @JsonInclude(Include.NON_NULL)
     @SuppressFBWarnings("URF_UNREAD_FIELD")
     private static final class TreeEntry {
+
         private final String path;
         private final String mode;
         private final String type;
diff --git a/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testAdd/mappings/repos_sandboxx_ghtreebuildertest_git_trees-9-ca5764.json b/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testAdd/mappings/repos_sandboxx_ghtreebuildertest_git_trees-9-ca5764.json
index 7d7395e6a5..006a41e20c 100644
--- a/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testAdd/mappings/repos_sandboxx_ghtreebuildertest_git_trees-9-ca5764.json
+++ b/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testAdd/mappings/repos_sandboxx_ghtreebuildertest_git_trees-9-ca5764.json
@@ -6,7 +6,7 @@
     "method": "POST",
     "bodyPatterns": [
       {
-        "equalToJson": "{\"base_tree\":\"737e00d471104660a7e8177fd5deb58fc46bbbec\",\"tree\":[{\"path\":\"app/run.sh\",\"mode\":\"100755\",\"type\":\"blob\",\"sha\":\"e9ba7ba07276a794d493db90e0384940ce2b757b\",\"content\":null},{\"path\":\"doc/readme.txt\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"fbbc875b17d1e17da06b4ee8fda46e2596c41f3c\",\"content\":null},{\"path\":\"data/val1.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"aed2973e4b8a7ff1b30ff5c4751e5a2b38989e74\",\"content\":null},{\"path\":\"data/val2.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"5bd8bb897b13225c93a1d26baa88c96b7bd5d817\",\"content\":null}]}",
+        "equalToJson": "{\"base_tree\":\"737e00d471104660a7e8177fd5deb58fc46bbbec\",\"tree\":[{\"path\":\"app/run.sh\",\"mode\":\"100755\",\"type\":\"blob\",\"sha\":\"e9ba7ba07276a794d493db90e0384940ce2b757b\"},{\"path\":\"doc/readme.txt\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"fbbc875b17d1e17da06b4ee8fda46e2596c41f3c\"},{\"path\":\"data/val1.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"aed2973e4b8a7ff1b30ff5c4751e5a2b38989e74\"},{\"path\":\"data/val2.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"5bd8bb897b13225c93a1d26baa88c96b7bd5d817\"}]}",
         "ignoreArrayOrder": true,
         "ignoreExtraElements": true
       }
diff --git a/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testShaEntry/mappings/repos_sandboxx_ghtreebuildertest_git_trees-7-1c90d0.json b/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testShaEntry/mappings/repos_sandboxx_ghtreebuildertest_git_trees-7-1c90d0.json
index 1904c60b6f..402a9afd2d 100644
--- a/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testShaEntry/mappings/repos_sandboxx_ghtreebuildertest_git_trees-7-1c90d0.json
+++ b/src/test/resources/org/kohsuke/github/GHTreeBuilderTest/wiremock/testShaEntry/mappings/repos_sandboxx_ghtreebuildertest_git_trees-7-1c90d0.json
@@ -6,7 +6,7 @@
     "method": "POST",
     "bodyPatterns": [
       {
-        "equalToJson": "{\"base_tree\":\"c2066e756eb2185ed12419f790af4375c8b91e7b\",\"tree\":[{\"path\":\"data/val1.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"aed2973e4b8a7ff1b30ff5c4751e5a2b38989e74\",\"content\":null},{\"path\":\"data/val2.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"5bd8bb897b13225c93a1d26baa88c96b7bd5d817\",\"content\":null}]}",
+        "equalToJson": "{\"base_tree\":\"c2066e756eb2185ed12419f790af4375c8b91e7b\",\"tree\":[{\"path\":\"data/val1.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"aed2973e4b8a7ff1b30ff5c4751e5a2b38989e74\"},{\"path\":\"data/val2.dat\",\"mode\":\"100644\",\"type\":\"blob\",\"sha\":\"5bd8bb897b13225c93a1d26baa88c96b7bd5d817\"}]}",
         "ignoreArrayOrder": true,
         "ignoreExtraElements": true
       }