diff --git a/src/Standards/Squiz/Sniffs/WhiteSpace/MemberVarSpacingSniff.php b/src/Standards/Squiz/Sniffs/WhiteSpace/MemberVarSpacingSniff.php
index 773d25d4f5..847b43b8c5 100644
--- a/src/Standards/Squiz/Sniffs/WhiteSpace/MemberVarSpacingSniff.php
+++ b/src/Standards/Squiz/Sniffs/WhiteSpace/MemberVarSpacingSniff.php
@@ -47,6 +47,7 @@ protected function processMemberVar(File $phpcsFile, $stackPtr)
 
         $validPrefixes   = Tokens::$methodPrefixes;
         $validPrefixes[] = T_VAR;
+        $validPrefixes[] = T_READONLY;
 
         $startOfStatement = $phpcsFile->findPrevious($validPrefixes, ($stackPtr - 1), null, false, null, true);
         if ($startOfStatement === false) {
diff --git a/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc b/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc
index 12b55176c4..8072ece66b 100644
--- a/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc
+++ b/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc
@@ -372,3 +372,10 @@ enum SomeEnum
 
     case ONE = 'one';
 }
+
+class SupportReadonlyProperties {
+    readonly int $readonlyA;
+    public readonly string $publicReadonly;
+    readonly bool $readonlyB;
+    readonly private bool $readonlyPrivate;
+}
diff --git a/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc.fixed b/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc.fixed
index d683eaadfb..12953c21a3 100644
--- a/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc.fixed
+++ b/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.inc.fixed
@@ -357,3 +357,14 @@ enum SomeEnum
 
     case ONE = 'one';
 }
+
+class SupportReadonlyProperties {
+
+    readonly int $readonlyA;
+
+    public readonly string $publicReadonly;
+
+    readonly bool $readonlyB;
+
+    readonly private bool $readonlyPrivate;
+}
diff --git a/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.php b/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.php
index 548ee3baa8..671ed51f85 100644
--- a/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.php
+++ b/src/Standards/Squiz/Tests/WhiteSpace/MemberVarSpacingUnitTest.php
@@ -67,6 +67,10 @@ public function getErrorList()
             353 => 1,
             357 => 1,
             366 => 1,
+            377 => 1,
+            378 => 1,
+            379 => 1,
+            380 => 1,
         ];
 
     }//end getErrorList()