diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 4d38a749845..f18957ac526 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -8415,6 +8415,9 @@ void Tokenizer::findGarbageCode() const
         else if (Token::Match(tok, "[({<] %assign%"))
             syntaxError(tok);
 
+        else if (Token::Match(tok, "[`\\@]"))
+            syntaxError(tok);
+
         // UNKNOWN_MACRO(return)
         if (tok->isKeyword() && Token::Match(tok, "throw|return )") && Token::Match(tok->linkAt(1)->previous(), "%name% ("))
             unknownMacroError(tok->linkAt(1)->previous());
diff --git a/test/testgarbage.cpp b/test/testgarbage.cpp
index 8972da28463..776d96cd9c5 100644
--- a/test/testgarbage.cpp
+++ b/test/testgarbage.cpp
@@ -253,6 +253,7 @@ class TestGarbage : public TestFixture {
         TEST_CASE(garbageCode223); // #11639
         TEST_CASE(garbageCode224);
         TEST_CASE(garbageCode225);
+        TEST_CASE(garbageCode226);
 
         TEST_CASE(garbageCodeFuzzerClientMode1); // test cases created with the fuzzer client, mode 1
 
@@ -1740,6 +1741,11 @@ class TestGarbage : public TestFixture {
         ASSERT_THROW_INTERNAL(checkCode("int n() { c * s0, 0 s0 = c(sizeof = ) }"), SYNTAX);
         ASSERT_THROW_INTERNAL(checkCode("int n() { c * s0, 0 s0 = c(sizeof |= ) }"), SYNTAX);
     }
+    void garbageCode226() {
+        ASSERT_THROW_INTERNAL(checkCode("int a() { (b((c)`)) } {}"), SYNTAX); // #11638
+        ASSERT_THROW_INTERNAL(checkCode("int a() { (b((c)\\)) } {}"), SYNTAX);
+        ASSERT_THROW_INTERNAL(checkCode("int a() { (b((c)@)) } {}"), SYNTAX);
+    }
 
     void syntaxErrorFirstToken() {
         ASSERT_THROW_INTERNAL(checkCode("&operator(){[]};"), SYNTAX); // #7818
diff --git a/test/testother.cpp b/test/testother.cpp
index eaddae272c6..a558cb922f5 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -4386,7 +4386,7 @@ class TestOther : public TestFixture {
         ASSERT_EQUALS("", errout_str());
 
         // Ticket #6132 "crash: daca: kvirc CheckOther::checkRedundantAssignment()"
-        check("void HttpFileTransfer :: transferTerminated ( bool bSuccess@1 ) {\n"
+        check("void HttpFileTransfer :: transferTerminated ( bool bSuccess ) {\n"
               "if ( m_szCompletionCallback . isNull ( ) ) {\n"
               "KVS_TRIGGER_EVENT ( KviEvent_OnHTTPGetTerminated , out ? out : ( g_pApp . activeConsole ( ) ) , & vParams )\n"
               "} else {\n"