diff --git a/src/hashtable.h b/src/hashtable.h
index 3a4e6a7e3..be21be2b1 100644
--- a/src/hashtable.h
+++ b/src/hashtable.h
@@ -4,6 +4,7 @@
 #include "git2/common.h"
 #include "git2/oid.h"
 #include "git2/odb.h"
+#include "common.h"
 
 #define GIT_HASHTABLE_HASHES 3