diff --git a/src/branches2.cpp b/src/branches2.cpp
index 42534dfa..bfa02678 100644
--- a/src/branches2.cpp
+++ b/src/branches2.cpp
@@ -4,6 +4,8 @@
 
 #include <iostream>
 
+#include <errno.h>
+
 Branches2::Branches2()
 {