diff --git a/spec/ameba/rules/line_length_spec.cr b/spec/ameba/rules/line_length_spec.cr
index b34bde5c..cdf19676 100644
--- a/spec/ameba/rules/line_length_spec.cr
+++ b/spec/ameba/rules/line_length_spec.cr
@@ -2,7 +2,7 @@ require "../../spec_helper"
 
 module Ameba::Rules
   subject = LineLength.new
-  long_line = "*" * 80
+  long_line = "*" * 81
 
   describe LineLength do
     it "passes if all lines are shorter than 80 symbols" do
@@ -11,7 +11,7 @@ module Ameba::Rules
     end
 
     it "passes if line consists of 79 symbols" do
-      source = Source.new "*" * 79
+      source = Source.new "*" * 80
       subject.catch(source).should be_valid
     end
 
@@ -27,7 +27,7 @@ module Ameba::Rules
       error = source.errors.first
       error.rule.should eq subject
       error.pos.should eq 1
-      error.message.should eq "Line too long (80 symbols)"
+      error.message.should eq "Line too long (81 symbols)"
     end
   end
 end
diff --git a/src/ameba/rules/line_length.cr b/src/ameba/rules/line_length.cr
index 3d6e2c0d..150a8045 100644
--- a/src/ameba/rules/line_length.cr
+++ b/src/ameba/rules/line_length.cr
@@ -1,10 +1,10 @@
 module Ameba::Rules
-  # A rule that disallows lines longer than 79 symbols.
+  # A rule that disallows lines longer than 80 symbols.
   #
   struct LineLength < Rule
     def test(source)
       source.lines.each_with_index do |line, index|
-        next unless line.size > 79
+        next unless line.size > 80
         source.error self, index + 1,
           "Line too long (#{line.size} symbols)"
       end