diff --git a/src/visualizer.cpp b/src/visualizer.cpp
index d3309163..736400f5 100644
--- a/src/visualizer.cpp
+++ b/src/visualizer.cpp
@@ -31,6 +31,7 @@
 #include <limits>
 #include <fcntl.h>
 #include <sys/time.h>
+#include <unistd.h>
 
 using Global::MainStartY;
 using Global::MainHeight;
diff --git a/src/window.cpp b/src/window.cpp
index 187f281d..7153786a 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -25,6 +25,7 @@
 # include <winsock.h>
 #else
 # include <sys/select.h>
+# include <unistd.h>
 #endif
 
 #include "error.h"