diff --git a/src/shrpx_log.cc b/src/shrpx_log.cc
index 0eff4ac0..ec8b27e8 100644
--- a/src/shrpx_log.cc
+++ b/src/shrpx_log.cc
@@ -34,6 +34,8 @@
 #include <inttypes.h>
 #endif // HAVE_INTTYPES_H
 
+#include <sys/wait.h>
+
 #include <cerrno>
 #include <cstdio>
 #include <cstring>