diff --git a/src/d_stats.cpp b/src/d_stats.cpp
index 3cb089b4d2..d2005d4cdc 100644
--- a/src/d_stats.cpp
+++ b/src/d_stats.cpp
@@ -9,6 +9,7 @@ extern int sys_ostype;
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <netdb.h>
+#include <unistd.h>
 #endif
 
 #include <thread>