diff --git a/fc-lang/fc-lang.c b/fc-lang/fc-lang.c
index 38fc697..3443f51 100644
--- a/fc-lang/fc-lang.c
+++ b/fc-lang/fc-lang.c
@@ -561,6 +561,9 @@
 	while (setRangeChar <= c && c <= 'z')
 	    setRangeStart[setRangeChar++ - 'a'] = i;
     }
+    while (setRangeChar <= 'z') /* no language code starts with these letters */
+	setRangeStart[setRangeChar++ - 'a'] = i;
+
     for (setRangeChar = 'a'; setRangeChar < 'z'; setRangeChar++)
 	setRangeEnd[setRangeChar - 'a'] = setRangeStart[setRangeChar+1-'a'] - 1;
     setRangeEnd[setRangeChar - 'a'] = i - 1;