diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index 08e75aef738..7e4d4adc443 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -1429,7 +1429,7 @@ void CheckClass::checkMemset()
                     const std::set<const Scope *> parsedTypes;
                     checkMemsetType(scope, tok, type, false, parsedTypes);
                 }
-            } else if (tok->variable() && tok->variable()->typeScope() && Token::Match(tok, "%var% = %name% (")) {
+            } else if (tok->variable() && tok->variable()->isPointer() && tok->variable()->typeScope() && Token::Match(tok, "%var% = %name% (")) {
                 const Library::AllocFunc* alloc = mSettings->library.getAllocFuncInfo(tok->tokAt(2));
                 if (!alloc)
                     alloc = mSettings->library.getReallocFuncInfo(tok->tokAt(2));
diff --git a/test/testclass.cpp b/test/testclass.cpp
index 6c26bb24add..5938170a1f5 100644
--- a/test/testclass.cpp
+++ b/test/testclass.cpp
@@ -3598,6 +3598,15 @@ class TestClass : public TestFixture {
                       "    AutoCloseFD fd = open(\"abc\", O_RDONLY | O_CLOEXEC);\n"
                       "}");
         ASSERT_EQUALS("", errout.str());
+
+        checkNoMemset("struct C {\n" // #12313
+                      "    char* p;\n"
+                      "    C(char* ptr) : p(ptr) {}\n"
+                      "};\n"
+                      "void f() {\n"
+                      "    C c = strdup(\"abc\");\n"
+                      "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
 #define checkThisSubtraction(code) checkThisSubtraction_(code, __FILE__, __LINE__)