diff --git a/webcc/logger.cc b/webcc/logger.cc
index 243039d..1774150 100644
--- a/webcc/logger.cc
+++ b/webcc/logger.cc
@@ -11,6 +11,7 @@
 #include <sstream>
 #include <string>
 #include <thread>
+#include <unistd.h>
 
 #if (defined(_WIN32) || defined(_WIN64))
 #include <Windows.h>