diff --git a/outlib.h b/outlib.h
index 03524b974..5057e8025 100644
--- a/outlib.h
+++ b/outlib.h
@@ -1,9 +1,9 @@
 #ifndef NASM_OUTLIB_H
-#define NSAM_OUTLIB_H
+#define NASM_OUTLIB_H
 
 #include "nasm.h"
 
 uint64_t realsize(enum out_type type, uint64_t size);
 
-#endif /* LIBOUT_H */
+#endif /* NASM_OUTLIB_H */