diff --git a/src/protocols/rdp/rdp_settings.c b/src/protocols/rdp/rdp_settings.c
index 78e97078..27553e3b 100644
--- a/src/protocols/rdp/rdp_settings.c
+++ b/src/protocols/rdp/rdp_settings.c
@@ -35,6 +35,7 @@
 #include "compat/winpr-wtypes.h"
 #endif
 
+#include <errno.h>
 #include <stddef.h>
 #include <string.h>