diff --git a/README.md b/README.md
index b44b78e73..46fadddc8 100644
--- a/README.md
+++ b/README.md
@@ -126,6 +126,7 @@ Slevomat Coding Standard for [PHP_CodeSniffer](https://github.com/squizlabs/PHP_
  - [SlevomatCodingStandard.Functions.DisallowTrailingCommaInClosureUse](doc/functions.md#slevomatcodingstandardfunctionsdisallowtrailingcommainclosureuse-) 🔧
  - [SlevomatCodingStandard.Functions.DisallowTrailingCommaInDeclaration](doc/functions.md#slevomatcodingstandardfunctionsdisallowtrailingcommaindeclaration-) 🔧
  - [SlevomatCodingStandard.Functions.FunctionLength](doc/functions.md#slevomatcodingstandardfunctionsfunctionlength)
+ - [SlevomatCodingStandard.Functions.NamedArgumentSpacing](doc/functions.md#slevomatcodingstandardfunctionsnamedargumentspacing-) 🔧
  - [SlevomatCodingStandard.Functions.RequireArrowFunction](doc/functions.md#slevomatcodingstandardfunctionsrequirearrowfunction-) 🔧
  - [SlevomatCodingStandard.Functions.RequireMultiLineCall](doc/functions.md#slevomatcodingstandardfunctionsrequiremultilinecall-) 🔧
  - [SlevomatCodingStandard.Functions.RequireSingleLineCall](doc/functions.md#slevomatcodingstandardfunctionsrequiresinglelinecall-) 🔧
diff --git a/SlevomatCodingStandard/Sniffs/Functions/NamedArgumentSpacingSniff.php b/SlevomatCodingStandard/Sniffs/Functions/NamedArgumentSpacingSniff.php
new file mode 100644
index 000000000..5ad5c821c
--- /dev/null
+++ b/SlevomatCodingStandard/Sniffs/Functions/NamedArgumentSpacingSniff.php
@@ -0,0 +1,79 @@
+<?php declare(strict_types = 1);
+
+namespace SlevomatCodingStandard\Sniffs\Functions;
+
+use PHP_CodeSniffer\Files\File;
+use PHP_CodeSniffer\Sniffs\Sniff;
+use SlevomatCodingStandard\Helpers\TokenHelper;
+use function sprintf;
+use const T_COLON;
+use const T_PARAM_NAME;
+use const T_WHITESPACE;
+
+class NamedArgumentSpacingSniff implements Sniff
+{
+
+	public const CODE_WHITESPACE_BEFORE_COLOR = 'WhitespaceBeforeColon';
+	public const CODE_NO_WHITESPACE_AFTER_COLON = 'NoWhitespaceAfterColon';
+
+	/**
+	 * @return list<string>
+	 */
+	public function register(): array
+	{
+		return [
+			T_PARAM_NAME,
+		];
+	}
+
+	/**
+	 * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+	 * @param int $pointer
+	 */
+	public function process(File $phpcsFile, $pointer): void
+	{
+		$tokens = $phpcsFile->getTokens();
+
+		/** @var int $colonPointer */
+		$colonPointer = TokenHelper::findNext($phpcsFile, T_COLON, $pointer + 1);
+
+		$parameterName = $tokens[$pointer]['content'];
+
+		if ($colonPointer !== $pointer + 1) {
+			$fix = $phpcsFile->addFixableError(
+				sprintf('There must be no whitespace between named argument "%s" and colon.', $parameterName),
+				$colonPointer,
+				self::CODE_WHITESPACE_BEFORE_COLOR
+			);
+			if ($fix) {
+				$phpcsFile->fixer->replaceToken($colonPointer - 1, '');
+			}
+		}
+
+		$whitespacePointer = $colonPointer + 1;
+
+		if (
+			$tokens[$whitespacePointer]['code'] === T_WHITESPACE
+			&& $tokens[$whitespacePointer]['content'] === ' '
+		) {
+			return;
+		}
+
+		$fix = $phpcsFile->addFixableError(
+			sprintf('There must be exactly one space after colon in named argument "%s".', $parameterName),
+			$colonPointer,
+			self::CODE_NO_WHITESPACE_AFTER_COLON
+		);
+
+		if (!$fix) {
+			return;
+		}
+
+		if ($tokens[$whitespacePointer]['code'] === T_WHITESPACE) {
+			$phpcsFile->fixer->replaceToken($whitespacePointer, ' ');
+		} else {
+			$phpcsFile->fixer->addContent($colonPointer, ' ');
+		}
+	}
+
+}
diff --git a/build/phpcs.xml b/build/phpcs.xml
index b999b8aa1..929551e3f 100644
--- a/build/phpcs.xml
+++ b/build/phpcs.xml
@@ -370,6 +370,7 @@
 	<rule ref="SlevomatCodingStandard.Functions.DisallowTrailingCommaInCall"/>
 	<rule ref="SlevomatCodingStandard.Functions.DisallowTrailingCommaInClosureUse"/>
 	<rule ref="SlevomatCodingStandard.Functions.DisallowTrailingCommaInDeclaration"/>
+	<rule ref="SlevomatCodingStandard.Functions.NamedArgumentSpacing"/>
 	<rule ref="SlevomatCodingStandard.Functions.StaticClosure"/>
 	<rule ref="SlevomatCodingStandard.Functions.StrictCall"/>
 	<rule ref="SlevomatCodingStandard.Functions.RequireMultiLineCall">
diff --git a/doc/functions.md b/doc/functions.md
index 5ea350d67..2766552c5 100644
--- a/doc/functions.md
+++ b/doc/functions.md
@@ -57,6 +57,10 @@ Sniff provides the following settings:
 
 This sniff disallows usage of named arguments.
 
+#### SlevomatCodingStandard.Functions.NamedArgumentSpacing 🔧
+
+Checks spacing in named argument.
+
 #### SlevomatCodingStandard.Functions.DisallowTrailingCommaInCall 🔧
 
 This sniff disallows trailing commas in multi-line calls.
diff --git a/tests/Sniffs/Functions/NamedArgumentSpacingSniffTest.php b/tests/Sniffs/Functions/NamedArgumentSpacingSniffTest.php
new file mode 100644
index 000000000..8b479437a
--- /dev/null
+++ b/tests/Sniffs/Functions/NamedArgumentSpacingSniffTest.php
@@ -0,0 +1,44 @@
+<?php declare(strict_types = 1);
+
+namespace SlevomatCodingStandard\Sniffs\Functions;
+
+use SlevomatCodingStandard\Sniffs\TestCase;
+
+class NamedArgumentSpacingSniffTest extends TestCase
+{
+
+	public function testNoErrors(): void
+	{
+		$report = self::checkFile(__DIR__ . '/data/namedArgumentSpacingNoErrors.php');
+		self::assertNoSniffErrorInFile($report);
+	}
+
+	public function testErrors(): void
+	{
+		$report = self::checkFile(__DIR__ . '/data/namedArgumentSpacingErrors.php');
+
+		self::assertSame(3, $report->getErrorCount());
+
+		self::assertSniffError(
+			$report,
+			3,
+			NamedArgumentSpacingSniff::CODE_WHITESPACE_BEFORE_COLOR,
+			'There must be no whitespace between named argument "search" and colon.'
+		);
+		self::assertSniffError(
+			$report,
+			4,
+			NamedArgumentSpacingSniff::CODE_NO_WHITESPACE_AFTER_COLON,
+			'There must be exactly one space after colon in named argument "search".'
+		);
+		self::assertSniffError(
+			$report,
+			4,
+			NamedArgumentSpacingSniff::CODE_NO_WHITESPACE_AFTER_COLON,
+			'There must be exactly one space after colon in named argument "subject".'
+		);
+
+		self::assertAllFixedInFile($report);
+	}
+
+}
diff --git a/tests/Sniffs/Functions/data/namedArgumentSpacingErrors.fixed.php b/tests/Sniffs/Functions/data/namedArgumentSpacingErrors.fixed.php
new file mode 100644
index 000000000..2113bfed2
--- /dev/null
+++ b/tests/Sniffs/Functions/data/namedArgumentSpacingErrors.fixed.php
@@ -0,0 +1,4 @@
+<?php // lint >= 8.0
+
+str_replace(search: 'foo', replace: 'bar', subject: 'foo lol');
+str_replace(search: 'foo', replace: 'bar', subject: 'foo lol');
diff --git a/tests/Sniffs/Functions/data/namedArgumentSpacingErrors.php b/tests/Sniffs/Functions/data/namedArgumentSpacingErrors.php
new file mode 100644
index 000000000..6eb7f2e14
--- /dev/null
+++ b/tests/Sniffs/Functions/data/namedArgumentSpacingErrors.php
@@ -0,0 +1,4 @@
+<?php // lint >= 8.0
+
+str_replace(search : 'foo', replace: 'bar', subject: 'foo lol');
+str_replace(search:'foo', replace: 'bar', subject:  'foo lol');
diff --git a/tests/Sniffs/Functions/data/namedArgumentSpacingNoErrors.php b/tests/Sniffs/Functions/data/namedArgumentSpacingNoErrors.php
new file mode 100644
index 000000000..741830802
--- /dev/null
+++ b/tests/Sniffs/Functions/data/namedArgumentSpacingNoErrors.php
@@ -0,0 +1,5 @@
+<?php // lint >= 8.0
+
+str_replace(search: 'foo', replace: 'bar', subject: 'foo lol'); // space before + missing space
+
+str_replace('foo', 'bar', 'foo');