diff --git a/src/core/utilities.cpp b/src/core/utilities.cpp
index 0978609cf..d8ad1943b 100644
--- a/src/core/utilities.cpp
+++ b/src/core/utilities.cpp
@@ -50,6 +50,7 @@
 #endif
 
 #ifdef Q_OS_LINUX
+#  include <unistd.h>
 #  include <sys/syscall.h>
 #endif
 #ifdef Q_OS_DARWIN