diff --git a/libj1939.h b/libj1939.h
index abd05d3..b6832cf 100644
--- a/libj1939.h
+++ b/libj1939.h
@@ -10,7 +10,7 @@
  * as published by the Free Software Foundation
  */
 
-/* needed on some 644 bit platforms to get consistent 64-bit types */
+/* needed on some 64 bit platforms to get consistent 64-bit types */
 #define __SANE_USERSPACE_TYPES__
 
 #include <sys/socket.h>