diff --git a/src/oid.c b/src/oid.c
index 5f3408511..bca03c4e4 100644
--- a/src/oid.c
+++ b/src/oid.c
@@ -23,6 +23,7 @@
  * Boston, MA 02110-1301, USA.
  */
 
+#include "common.h"
 #include "git/oid.h"
 #include <string.h>