diff --git a/libsrc/leddevice/LedDeviceWS2812b.cpp b/libsrc/leddevice/LedDeviceWS2812b.cpp
index 8a084b9c..70f7e708 100644
--- a/libsrc/leddevice/LedDeviceWS2812b.cpp
+++ b/libsrc/leddevice/LedDeviceWS2812b.cpp
@@ -11,6 +11,7 @@
 #include <fcntl.h>
 #include <stdarg.h>
 #include <sys/mman.h>
+#include <unistd.h>
 //#include <sys/types.h>
 //#include <sys/ioctl.h>