diff --git a/src/win32_monitor.c b/src/win32_monitor.c
index 03496411..4f5af36a 100644
--- a/src/win32_monitor.c
+++ b/src/win32_monitor.c
@@ -33,6 +33,7 @@
 #include <string.h>
 #include <limits.h>
 #include <malloc.h>
+#include <wchar.h>
 
 
 // Callback for EnumDisplayMonitors in createMonitor