diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index 6b028d417..897155c8b 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -2037,12 +2037,28 @@ bool CheckClass::isMemberVar(const Scope *scope, const Token *tok) const
         }
     } while (again);
 
-    for (const Variable &var : scope->varlist) {
+    for (const Variable& var : scope->varlist) {
         if (var.name() == tok->str()) {
-            if (tok->varId() == 0)
-                mSymbolDatabase->debugMessage(tok, "varid0", "CheckClass::isMemberVar found used member variable \'" + tok->str() + "\' with varid 0");
+            const Token* fqTok = tok;
+            while (Token::Match(fqTok->tokAt(-2), "%name% ::"))
+                fqTok = fqTok->tokAt(-2);
+            if (fqTok->strAt(-1) == "::")
+                fqTok = fqTok->previous();
+            bool isMember = tok == fqTok;
+            std::string scopeStr;
+            const Scope* curScope = scope;
+            while (!isMember && curScope && curScope->type != Scope::ScopeType::eGlobal) {
+                scopeStr.insert(0, curScope->className + " :: ");
+                isMember = Token::Match(fqTok, scopeStr.c_str());
 
-            return !var.isStatic();
+                curScope = curScope->nestedIn;
+            }
+            if (isMember) {
+                if (tok->varId() == 0)
+                    mSymbolDatabase->debugMessage(tok, "varid0", "CheckClass::isMemberVar found used member variable \'" + tok->str() + "\' with varid 0");
+
+                return !var.isStatic();
+            }
         }
     }
 
diff --git a/test/testclass.cpp b/test/testclass.cpp
index 58449c261..892e6775f 100644
--- a/test/testclass.cpp
+++ b/test/testclass.cpp
@@ -191,6 +191,7 @@ private:
         TEST_CASE(const72); // ticket #10520
         TEST_CASE(const73); // ticket #10735
         TEST_CASE(const74); // ticket #10671
+        TEST_CASE(const75); // ticket #10065
         TEST_CASE(const_handleDefaultParameters);
         TEST_CASE(const_passThisToMemberOfOtherClass);
         TEST_CASE(assigningPointerToPointerIsNotAConstOperation);
@@ -5963,6 +5964,36 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void const75() { // #10065
+        checkConst("namespace N { int i = 0; }\n"
+                   "struct S {\n"
+                   "    int i;\n"
+                   "    void f() {\n"
+                   "        if (N::i) {}\n"
+                   "    }\n"
+                   "};\n");
+        ASSERT_EQUALS("[test.cpp:4]: (performance, inconclusive) Technically the member function 'S::f' can be static (but you may consider moving to unnamed namespace).\n", errout.str());
+
+        checkConst("int i = 0;\n"
+                   "struct S {\n"
+                   "    int i;\n"
+                   "    void f() {\n"
+                   "        if (::i) {}\n"
+                   "    }\n"
+                   "};\n");
+        ASSERT_EQUALS("[test.cpp:4]: (performance, inconclusive) Technically the member function 'S::f' can be static (but you may consider moving to unnamed namespace).\n", errout.str());
+
+        checkConst("namespace N {\n"
+                   "    struct S {\n"
+                   "        int i;\n"
+                   "        void f() {\n"
+                   "            if (N::S::i) {}\n"
+                   "        }\n"
+                   "    };\n"
+                   "}\n");
+        ASSERT_EQUALS("[test.cpp:4]: (style, inconclusive) Technically the member function 'N::S::f' can be const.\n", errout.str());
+    }
+
     void const_handleDefaultParameters() {
         checkConst("struct Foo {\n"
                    "    void foo1(int i, int j = 0) {\n"