diff --git a/src/pygit2.c b/src/pygit2.c
index 8362891..94bb06d 100644
--- a/src/pygit2.c
+++ b/src/pygit2.c
@@ -383,6 +383,14 @@ moduleinit(PyObject* m)
     ADD_CONSTANT_INT(m, GIT_DIFF_INCLUDE_UNTRACKED)
     ADD_CONSTANT_INT(m, GIT_DIFF_INCLUDE_UNMODIFIED)
     ADD_CONSTANT_INT(m, GIT_DIFF_RECURSE_UNTRACKED_DIRS)
+    ADD_CONSTANT_INT(m, GIT_DIFF_RECURSE_UNTRACKED_DIRS)
+    ADD_CONSTANT_INT(m, GIT_DIFF_DISABLE_PATHSPEC_MATCH)
+    ADD_CONSTANT_INT(m, GIT_DIFF_DELTAS_ARE_ICASE)
+    ADD_CONSTANT_INT(m, GIT_DIFF_INCLUDE_UNTRACKED_CONTENT)
+    ADD_CONSTANT_INT(m, GIT_DIFF_SKIP_BINARY_CHECK)
+    ADD_CONSTANT_INT(m, GIT_DIFF_INCLUDE_TYPECHANGE)
+    ADD_CONSTANT_INT(m, GIT_DIFF_INCLUDE_TYPECHANGE_TREES)
+    ADD_CONSTANT_INT(m, GIT_DIFF_RECURSE_IGNORED_DIRS)
     /* Flags for diff find similar */
     /* --find-renames */
     ADD_CONSTANT_INT(m, GIT_DIFF_FIND_RENAMES)