diff --git a/.dscanner.ini b/.dscanner.ini
index 0b8ac4f..db6131b 100644
--- a/.dscanner.ini
+++ b/.dscanner.ini
@@ -57,8 +57,10 @@ redundant_parens_check="enabled"
 mismatched_args_check="enabled"
 ; Checks for labels with the same name as variables
 label_var_same_name_check="enabled"
-; Checks for lines longer than 120 characters
+; Checks for lines longer than `max_line_length` characters
 long_line_check="disabled"
+; Maximum line length in `long_line_check`.
+max_line_length="120"
 ; Checks for assignment to auto-ref function parameters
 auto_ref_assignment_check="enabled"
 ; Checks for incorrect infinite range definitions
diff --git a/README.md b/README.md
index 8071eb1..60ea2de 100644
--- a/README.md
+++ b/README.md
@@ -146,7 +146,7 @@ Note that the "--skipTests" option is the equivalent of changing each
 * Variables that could have been declared const or immutable (experimental)
 * Redundant parenthesis.
 * Unused labels.
-* Lines longer than 120 characters.
+* Lines longer than `max_line_length` characters.
 * Incorrect infinite range definitions.
 * Some assertions that check conditions that will always be true.
 * Auto functions without return statement. The compiler doesn't see an omission and it infers 'void' as return type.
diff --git a/src/dscanner/analysis/config.d b/src/dscanner/analysis/config.d
index c917e66..e5dcf54 100644
--- a/src/dscanner/analysis/config.d
+++ b/src/dscanner/analysis/config.d
@@ -140,9 +140,12 @@ struct StaticAnalysisConfig
 	@INI("Checks for labels with the same name as variables")
 	string label_var_same_name_check = Check.enabled;
 
-	@INI("Checks for lines longer than 120 characters")
+	@INI("Checks for lines longer than `max_line_length` characters")
 	string long_line_check = Check.enabled;
 
+	@INI("The maximum line length used in `long_line_check`.")
+	int max_line_length = 120;
+
 	@INI("Checks for assignment to auto-ref function parameters")
 	string auto_ref_assignment_check = Check.enabled;
 
diff --git a/src/dscanner/analysis/line_length.d b/src/dscanner/analysis/line_length.d
index f10c3d2..0c28631 100644
--- a/src/dscanner/analysis/line_length.d
+++ b/src/dscanner/analysis/line_length.d
@@ -13,17 +13,18 @@ import dparse.lexer;
 import std.typecons : tuple, Tuple;
 
 /**
- * Checks for lines longer than 120 characters
+ * Checks for lines longer than `max_line_length` characters
  */
 final class LineLengthCheck : BaseAnalyzer
 {
 	mixin AnalyzerInfo!"long_line_check";
 
 	///
-	this(string fileName, const(Token)[] tokens, bool skipTests = false)
+	this(string fileName, const(Token)[] tokens, int maxLineLength, bool skipTests = false)
 	{
 		super(fileName, null, skipTests);
 		this.tokens = tokens;
+		this.maxLineLength = maxLineLength;
 	}
 
 	override void visit(const Module)
@@ -44,7 +45,7 @@ final class LineLengthCheck : BaseAnalyzer
 						: 0;
 				endColumn += wsChange + info.length;
 			}
-			if (endColumn > MAX_LINE_LENGTH)
+			if (endColumn > maxLineLength)
 				triggerError(token);
 		}
 	}
@@ -59,7 +60,7 @@ private:
 	{
 		if (tok.line != lastErrorLine)
 		{
-			addErrorMessage(tok.line, tok.column, KEY, MESSAGE);
+			addErrorMessage(tok.line, tok.column, KEY, message);
 			lastErrorLine = tok.line;
 		}
 	}
@@ -79,7 +80,7 @@ private:
 		{
 			if (isLineSeparator(c))
 			{
-				if (col > MAX_LINE_LENGTH)
+				if (col > maxLineLength)
 					triggerError(tok);
 				col = 1;
 			}
@@ -91,9 +92,9 @@ private:
 
 	unittest
 	{
-		assert(new LineLengthCheck(null, null).checkMultiLineToken(Token(tok!"stringLiteral", "		", 0, 0, 0)) == 8);
-		assert(new LineLengthCheck(null, null).checkMultiLineToken(Token(tok!"stringLiteral", "		\na", 0, 0, 0)) == 2);
-		assert(new LineLengthCheck(null, null).checkMultiLineToken(Token(tok!"stringLiteral", "		\n	", 0, 0, 0)) == 5);
+		assert(new LineLengthCheck(null, null, 120).checkMultiLineToken(Token(tok!"stringLiteral", "		", 0, 0, 0)) == 8);
+		assert(new LineLengthCheck(null, null, 120).checkMultiLineToken(Token(tok!"stringLiteral", "		\na", 0, 0, 0)) == 2);
+		assert(new LineLengthCheck(null, null, 120).checkMultiLineToken(Token(tok!"stringLiteral", "		\n	", 0, 0, 0)) == 5);
 	}
 
 	static size_t tokenByteLength()(auto ref const Token tok)
@@ -155,9 +156,13 @@ private:
 
 	import std.conv : to;
 
+	string message() const
+	{
+		return "Line is longer than " ~ to!string(maxLineLength) ~ " characters";
+	}
+
 	enum string KEY = "dscanner.style.long_line";
-	enum string MESSAGE = "Line is longer than " ~ to!string(MAX_LINE_LENGTH) ~ " characters";
-	enum MAX_LINE_LENGTH = 120;
+	const int maxLineLength;
 	const(Token)[] tokens;
 }
 
@@ -201,5 +206,20 @@ assert("foo" == "foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
                 `);
 	}c, sac);
 
+	// Test customizing max_line_length.
+	sac.max_line_length = 115;
+	assertAnalyzerWarnings(q{
+Window window = Platform.instance.createWindow("Дистанционное управлсварочным оборудованием			   ", null);
+Window window = Platform.instance.createWindow("Дистанционное управлсварочным оборудованием				", null); // [warn]: Line is longer than 115 characters
+unittest {
+// with tabs
+assert("foo" == "fooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo1");
+assert("foo" == "foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo2"); // [warn]: Line is longer than 115 characters
+// with whitespace (don't overwrite)
+    assert("foo" == "booooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo3");
+    assert("foo" == "boooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo4"); // [warn]: Line is longer than 115 characters
+}
+	}c, sac);
+
 	stderr.writeln("Unittest for LineLengthCheck passed.");
 }
diff --git a/src/dscanner/analysis/run.d b/src/dscanner/analysis/run.d
index a16147c..b04dbb4 100644
--- a/src/dscanner/analysis/run.d
+++ b/src/dscanner/analysis/run.d
@@ -502,6 +502,7 @@ MessageSet analyze(string fileName, const Module m, const StaticAnalysisConfig a
 
 	if (moduleName.shouldRun!LineLengthCheck(analysisConfig))
 		checks ~= new LineLengthCheck(fileName, tokens,
+		analysisConfig.max_line_length,
 		analysisConfig.long_line_check == Check.skipTests && !ut);
 
 	if (moduleName.shouldRun!AutoRefAssignmentCheck(analysisConfig))