diff --git a/lib/pure/strutils.nim b/lib/pure/strutils.nim
index b61df6086..6c561eaf9 100644
--- a/lib/pure/strutils.nim
+++ b/lib/pure/strutils.nim
@@ -1281,7 +1281,7 @@ proc editDistance*(a, b: string): int {.noSideEffect,
 
   # another special case:
   if len1 == 1:
-    for j in s..len2-1:
+    for j in s..s+len2-1:
       if a[s] == b[j]: return len2 - 1
     return len2