diff --git a/src/Standards/Squiz/Sniffs/WhiteSpace/OperatorSpacingSniff.php b/src/Standards/Squiz/Sniffs/WhiteSpace/OperatorSpacingSniff.php
index fd4bf44fcc..b33880554c 100644
--- a/src/Standards/Squiz/Sniffs/WhiteSpace/OperatorSpacingSniff.php
+++ b/src/Standards/Squiz/Sniffs/WhiteSpace/OperatorSpacingSniff.php
@@ -345,6 +345,7 @@ protected function isOperator(File $phpcsFile, $stackPtr)
                     $function = $tokens[$bracket]['parenthesis_owner'];
                     if ($tokens[$function]['code'] === T_FUNCTION
                         || $tokens[$function]['code'] === T_CLOSURE
+                        || $tokens[$function]['code'] === T_FN
                         || $tokens[$function]['code'] === T_DECLARE
                     ) {
                         return false;
diff --git a/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc b/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc
index dead30680a..e204d0ee2a 100644
--- a/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc
+++ b/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc
@@ -465,5 +465,10 @@ $a = $a ? - $b : - $b;
 
 exit -1;
 
+$cl = function ($boo =-1) {};
+$cl = function ($boo =+1) {};
+$fn = fn ($boo =-1) => $boo;
+$fn = fn ($boo =+1) => $boo;
+
 /* Intentional parse error. This has to be the last test in the file. */
 $a = 10 +
diff --git a/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc.fixed b/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc.fixed
index 1179b4e3a2..b1978f0bbe 100644
--- a/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc.fixed
+++ b/src/Standards/Squiz/Tests/WhiteSpace/OperatorSpacingUnitTest.inc.fixed
@@ -459,5 +459,10 @@ $a = $a ? - $b : - $b;
 
 exit -1;
 
+$cl = function ($boo =-1) {};
+$cl = function ($boo =+1) {};
+$fn = fn ($boo =-1) => $boo;
+$fn = fn ($boo =+1) => $boo;
+
 /* Intentional parse error. This has to be the last test in the file. */
 $a = 10 +