diff --git a/src/charset.h b/src/charset.h
index 2cc0f0ce017..1b2ac59bec5 100644
--- a/src/charset.h
+++ b/src/charset.h
@@ -835,7 +835,7 @@ extern Lisp_Object Vauto_fill_chars;
 #define BCOPY_SHORT(from, to, len)		\
   do {						\
     int i = len;				\
-    unsigined char *from_p = from, *to_p = to;	\
+    unsigned char *from_p = from, *to_p = to;	\
     while (i--) *from_p++ = *to_p++;		\
   } while (0)