diff --git a/include/git2/common.h b/include/git2/common.h
index ddeaf77a2..1363316b6 100644
--- a/include/git2/common.h
+++ b/include/git2/common.h
@@ -83,8 +83,6 @@ GIT_BEGIN_DECL
  */
 #define GIT_OID_HEX_ZERO "0000000000000000000000000000000000000000"
 
-#define FLAG_BITS 27
-
 /**
  * Return the version of the libgit2 library
  * being currently used.
diff --git a/src/commit_list.h b/src/commit_list.h
index 7cd3945ae..6b3f473d3 100644
--- a/src/commit_list.h
+++ b/src/commit_list.h
@@ -18,6 +18,8 @@
 #define COMMIT_ALLOC \
 	(sizeof(git_commit_list_node) + PARENTS_PER_COMMIT * sizeof(git_commit_list_node *))
 
+#define FLAG_BITS 4
+
 typedef struct git_commit_list_node {
 	git_oid oid;
 	uint32_t time;