diff --git a/src/Standards/PSR2/Sniffs/Classes/ClassDeclarationSniff.php b/src/Standards/PSR2/Sniffs/Classes/ClassDeclarationSniff.php
index 6eaa6ac049..420ca7780a 100644
--- a/src/Standards/PSR2/Sniffs/Classes/ClassDeclarationSniff.php
+++ b/src/Standards/PSR2/Sniffs/Classes/ClassDeclarationSniff.php
@@ -314,12 +314,14 @@ public function processOpen(File $phpcsFile, $stackPtr)
             if ($checkingImplements === true
                 && $multiLineImplements === true
                 && ($tokens[($className - 1)]['code'] !== T_NS_SEPARATOR
-                || $tokens[($className - 2)]['code'] !== T_STRING)
+                || ($tokens[($className - 2)]['code'] !== T_STRING
+                && $tokens[($className - 2)]['code'] !== T_NAMESPACE))
             ) {
                 $prev = $phpcsFile->findPrevious(
                     [
                         T_NS_SEPARATOR,
                         T_WHITESPACE,
+                        T_NAMESPACE,
                     ],
                     ($className - 1),
                     $implements,
diff --git a/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc b/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc
index 00892d00c7..17f8c80869 100644
--- a/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc
+++ b/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc
@@ -287,3 +287,9 @@ readonly
 interface FooBar extends namespace\BarFoo
 {
 }
+
+// Safeguard against fixer conflict when there are namespace relative interface names in a  multi-line implements.
+class BarFoo implements
+    namespace\BarFoo
+{
+}
diff --git a/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc.fixed b/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc.fixed
index 797f50b5d7..7e12d2d500 100644
--- a/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc.fixed
+++ b/src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc.fixed
@@ -275,3 +275,9 @@ readonly
 interface FooBar extends namespace\BarFoo
 {
 }
+
+// Safeguard against fixer conflict when there are namespace relative interface names in a  multi-line implements.
+class BarFoo implements
+    namespace\BarFoo
+{
+}