diff --git a/yaml/presenter.nim b/yaml/presenter.nim
index dcd1e5e..ad9c5d9 100644
--- a/yaml/presenter.nim
+++ b/yaml/presenter.nim
@@ -326,7 +326,7 @@ proc writeFolded(c: Context, scalar: string, indentation, indentStep: int,
         t.append(newline & newline)
         t.append(repeat(' ', indentation + indentStep))
         curPos = indentation + indentStep
-      elif curPos + (word.finish - word.start) > 80:
+      elif curPos + (word.finish - word.start + 1) > 80:
         t.append(newline)
         t.append(repeat(' ', indentation + indentStep))
         curPos = indentation + indentStep
@@ -822,4 +822,4 @@ proc transform*(input: Stream | string,
     ss = newStringStream()
     c = Context(target: ss, options: options)
   doTransform(c, genInput(input), resolveToCoreYamlTags)
-  return ss.data
\ No newline at end of file
+  return ss.data