diff --git a/src/shrpx_log.cc b/src/shrpx_log.cc
index e6025170..62db35b6 100644
--- a/src/shrpx_log.cc
+++ b/src/shrpx_log.cc
@@ -28,6 +28,7 @@
 #include <unistd.h>
 #include <inttypes.h>
 
+#include <cerrno>
 #include <cstdio>
 #include <cstring>
 #include <ctime>