diff --git a/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php b/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php
index a8d5639d30c..03ce292a08c 100644
--- a/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php
+++ b/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php
@@ -285,6 +285,10 @@ private function ensureSingleLine(Tokens $tokens, $index)
         return true;
     }
 
+    /**
+     * @param Tokens $tokens
+     * @param int    $startFunctionIndex
+     */
     private function ensureFunctionFullyMultiline(Tokens $tokens, $startFunctionIndex)
     {
         // find out what the indentation is
@@ -295,17 +299,31 @@ private function ensureFunctionFullyMultiline(Tokens $tokens, $startFunctionInde
                 [[T_WHITESPACE]]
             );
             $searchIndex = $prevWhitespaceTokenIndex;
-        } while ($prevWhitespaceTokenIndex
+        } while (null !== $prevWhitespaceTokenIndex
             && false === strpos($tokens[$prevWhitespaceTokenIndex]->getContent(), "\n")
         );
-        $existingIndentation = $prevWhitespaceTokenIndex
-            ? ltrim($tokens[$prevWhitespaceTokenIndex]->getContent(), "\n\r")
-            : '';
+
+        if (null === $prevWhitespaceTokenIndex) {
+            $existingIndentation = '';
+        } else {
+            $existingIndentation = $tokens[$prevWhitespaceTokenIndex]->getContent();
+            $lastLineIndex = strrpos($existingIndentation, "\n");
+            $existingIndentation = false === $lastLineIndex
+                ? $existingIndentation
+                : substr($existingIndentation, $lastLineIndex + 1)
+            ;
+        }
 
         $indentation = $existingIndentation.$this->whitespacesConfig->getIndent();
         $endFunctionIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $startFunctionIndex);
+
         if (!$this->isNewline($tokens[$endFunctionIndex - 1])) {
-            $tokens->ensureWhitespaceAtIndex($endFunctionIndex, 0, $this->whitespacesConfig->getLineEnding().$existingIndentation);
+            $tokens->ensureWhitespaceAtIndex(
+                $endFunctionIndex,
+                0,
+                $this->whitespacesConfig->getLineEnding().$existingIndentation
+            );
+
             ++$endFunctionIndex;
         }
 
diff --git a/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php b/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php
index 565f3e4a3a8..6fbbcc289af 100644
--- a/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php
+++ b/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php
@@ -83,6 +83,45 @@ public function testFixWithDifferentLineEndings(
     public function provideFixCases()
     {
         return [
+            [
+                '<?php
+// space '.'
+$var1 = $a->some_method(
+    $var2
+);
+
+// space '.'
+$var2 = some_function(
+    $var2
+);
+
+    // space     '.'
+    $var2a = $z[1](
+        $var2a
+    );
+    '.'
+    $var3 = function(  $a, $b  ) { };
+',
+                '<?php
+// space '.'
+$var1 = $a->some_method(
+    $var2);
+
+// space '.'
+$var2 = some_function(
+    $var2);
+
+    // space     '.'
+    $var2a = $z[1](
+        $var2a
+    );
+    '.'
+    $var3 = function(  $a , $b  ) { };
+',
+                [
+                    'on_multiline' => 'ensure_fully_multiline',
+                ],
+            ],
             'default' => [
                 '<?php xyz("", "", "", "");',
                 '<?php xyz("","","","");',