diff --git a/src/spell.c b/src/spell.c
index 572f7fb..87c8f8a 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -1786,7 +1786,7 @@
 count_common_word(
     slang_T	*lp,
     char_u	*word,
-    int		len,	    // word length, -1 for upto NUL
+    int		len,	    // word length, -1 for up to NUL
     int		count)	    // 1 to count once, 10 to init
 {
     hash_T	hash;