diff --git a/src/global.c b/src/global.c
index f79bfd353..fcbcbb176 100644
--- a/src/global.c
+++ b/src/global.c
@@ -9,6 +9,7 @@
 #include "hash.h"
 #include "sysdir.h"
 #include "git2/global.h"
+#include "git2/sys/openssl.h"
 #include "thread-utils.h"