diff --git a/lib/checkvaarg.cpp b/lib/checkvaarg.cpp
index 4a248d0e4..23859b7df 100644
--- a/lib/checkvaarg.cpp
+++ b/lib/checkvaarg.cpp
@@ -39,7 +39,9 @@ void CheckVaarg::va_start_argument()
         const Scope* scope = symbolDatabase->functionScopes[i];
         const Function* function = scope->function;
         for (const Token* tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
-            if (Token::simpleMatch(tok, "va_start (")) {
+            if (!tok->scope()->isExecutable())
+                tok = tok->scope()->classEnd;
+            else if (Token::simpleMatch(tok, "va_start (")) {
                 const Token* param2 = tok->tokAt(2)->nextArgument();
                 if (!param2)
                     continue;
diff --git a/test/testvaarg.cpp b/test/testvaarg.cpp
index 777cf8063..e6dc84139 100644
--- a/test/testvaarg.cpp
+++ b/test/testvaarg.cpp
@@ -90,6 +90,18 @@ private:
               "    va_end(arg_ptr);\n"
               "}"); // Don't crash if less than expected arguments are given.
         ASSERT_EQUALS("", errout.str());
+
+        check("void assertf_fail(const char *assertion, const char *file, int line, const char *func, const char* msg, ...) {\n"
+              "    struct A {\n"
+              "        A(char* buf, int size) {}\n"
+              "            void printf(const char * format, ...) {\n"
+              "                va_list args;\n"
+              "                va_start(args, format);\n"
+              "                va_end(args);\n"
+              "        }\n"
+              "    };\n"
+              "}"); // Inner class (#6453)
+        ASSERT_EQUALS("", errout.str());
     }
 
     void referenceAs_va_start() {