diff --git a/src/slic3r/Utils/Serial.cpp b/src/slic3r/Utils/Serial.cpp
index 2fe8e29..092fa1f 100644
--- a/src/slic3r/Utils/Serial.cpp
+++ b/src/slic3r/Utils/Serial.cpp
@@ -49,7 +49,7 @@
 #ifndef _WIN32
 	#include <sys/ioctl.h>
 	#include <sys/time.h>
-	#include <sys/unistd.h>
+	#include <unistd.h>
 	#include <sys/select.h>
 #endif