diff --git a/src/frameworks/UBPlatformUtils_linux.cpp b/src/frameworks/UBPlatformUtils_linux.cpp
index 8c10c4c9..5566116a 100644
--- a/src/frameworks/UBPlatformUtils_linux.cpp
+++ b/src/frameworks/UBPlatformUtils_linux.cpp
@@ -17,6 +17,7 @@
 
 #include <QtGui>
 
+#include <unistd.h>
 #include <X11/Xlib.h>
 #include <X11/keysym.h>