diff --git a/lib/checkmemoryleak.cpp b/lib/checkmemoryleak.cpp
index 4acea2df7..a730eb69f 100644
--- a/lib/checkmemoryleak.cpp
+++ b/lib/checkmemoryleak.cpp
@@ -2745,7 +2745,7 @@ void CheckMemoryLeakNoVar::check()
 void CheckMemoryLeakNoVar::checkForUnusedReturnValue(const Scope *scope)
 {
     for (const Token *tok = scope->classStart; tok != scope->classEnd; tok = tok->next()) {
-        if (Token::Match(tok, "%name% (") && (!tok->next()->astParent() || tok->next()->astParent()->str() == "!" || tok->next()->astParent()->isComparisonOp()) && tok->next()->astOperand1() == tok) {
+        if (!tok->varId() && Token::Match(tok, "%name% (") && (!tok->next()->astParent() || tok->next()->astParent()->str() == "!" || tok->next()->astParent()->isComparisonOp()) && tok->next()->astOperand1() == tok) {
             const AllocType allocType = getAllocationType(tok, 0);
             if (allocType != No)
                 returnValueNotUsedError(tok, tok->str());
diff --git a/test/testmemleak.cpp b/test/testmemleak.cpp
index ac30a35f0..2c10098d6 100644
--- a/test/testmemleak.cpp
+++ b/test/testmemleak.cpp
@@ -6194,6 +6194,7 @@ private:
 
     void run() {
         settings.inconclusive = true;
+        settings.standards.posix = true;
         settings.addEnabled("warning");
 
         LOAD_LIB_2(settings.library, "gtk.cfg");
@@ -6374,6 +6375,13 @@ private:
               "    return foo;\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // Ticket #6536
+        check("struct S { S(int) {} };\n"
+              "void foo(int i) {\n"
+              "  S socket(i);\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void smartPointerFunctionParam() {