diff --git a/gwconio.h b/gwconio.h
index 21cf901..36739f0 100644
--- a/gwconio.h
+++ b/gwconio.h
@@ -1,7 +1,9 @@
+#ifndef GWCONIO_H
+#define GWCONIO_H
+
 void gwcputsxy (unsigned char x, unsigned char y, const char* s);
-
 void gwcputs (const char* s);
-
 void __fastcall__ gwcputcxy (unsigned char x, unsigned char y, char c);
-
 void __fastcall__ gwcputc (char c);
+
+#endif /* GWCONIO_H */