diff --git a/src/Parser/ConstantExpressionTrait.php b/src/Parser/ConstantExpressionTrait.php
index 86e6adfa..bd787851 100644
--- a/src/Parser/ConstantExpressionTrait.php
+++ b/src/Parser/ConstantExpressionTrait.php
@@ -139,7 +139,10 @@ trait ConstantExpressionTrait
     {
         $class = $this->classDef?->getNamespacedName(false)
             ?? (($this->namespace ? $this->namespace . '\\' : '') . $this->class);
-        $function = ($this->namespace ? $this->namespace . '\\' : '') . $this->function;
+        $function = $this->function;
+        if ($function !== '' && $this->methodDef === null && $this->namespace !== '') {
+            $function = $this->namespace . '\\' . $function;
+        }
         switch ($expr->getType()) {
             case 'Scalar_MagicConst_Dir':
                 return '"' . $this->escapeString($this->dir) . '"';
diff --git a/tests/compiler/namespace/magic-function-method.phpt b/tests/compiler/namespace/magic-function-method.phpt
new file mode 100644
index 00000000..4aa4c2ea
--- /dev/null
+++ b/tests/compiler/namespace/magic-function-method.phpt
@@ -0,0 +1,34 @@
+--TEST--
+__FUNCTION__ uses the short name in namespaced methods
+--FILE--
+<?php
+namespace MagicFunctionMethod {
+    class Example {
+        public function instanceMethod(): void {
+            echo __FUNCTION__, "\n", __METHOD__, "\n";
+        }
+
+        public static function staticMethod(): void {
+            echo __FUNCTION__, "\n", __METHOD__, "\n";
+        }
+    }
+
+    function namespacedFunction(): void {
+        echo __FUNCTION__, "\n";
+    }
+}
+
+namespace {
+    function main(): void {
+        (new \MagicFunctionMethod\Example())->instanceMethod();
+        \MagicFunctionMethod\Example::staticMethod();
+        \MagicFunctionMethod\namespacedFunction();
+    }
+}
+?>
+--EXPECT--
+instanceMethod
+MagicFunctionMethod\Example::instanceMethod
+staticMethod
+MagicFunctionMethod\Example::staticMethod
+MagicFunctionMethod\namespacedFunction