diff --git a/lib/checkfunctions.cpp b/lib/checkfunctions.cpp
index 98e8e340bc6..bfc370faefe 100644
--- a/lib/checkfunctions.cpp
+++ b/lib/checkfunctions.cpp
@@ -88,7 +88,7 @@ void CheckFunctions::checkProhibitedFunctions()
 
                 const Library::WarnInfo* wi = mSettings->library.getWarnInfo(tok);
                 if (wi) {
-                    if (mSettings->severity.isEnabled(wi->severity) && mSettings->standards.c >= wi->standards.c && mSettings->standards.cpp >= wi->standards.cpp) {
+                    if (mSettings->severity.isEnabled(wi->severity) && ((tok->isC() && mSettings->standards.c >= wi->standards.c) || (tok->isCpp() && mSettings->standards.cpp >= wi->standards.cpp))) {
                         const std::string daca = mSettings->daca ? "prohibited" : "";
                         reportError(tok, wi->severity, daca + tok->str() + "Called", wi->message, CWE477, Certainty::normal);
                     }
@@ -423,7 +423,7 @@ void CheckFunctions::missingReturnError(const Token* tok)
 //---------------------------------------------------------------------------
 void CheckFunctions::checkMathFunctions()
 {
-    const bool styleC99 = mSettings->severity.isEnabled(Severity::style) && mSettings->standards.c != Standards::C89 && mSettings->standards.cpp != Standards::CPP03;
+    const bool styleC99 = mSettings->severity.isEnabled(Severity::style) && ((mTokenizer->isC() && mSettings->standards.c != Standards::C89) || (mTokenizer->isCPP() && mSettings->standards.cpp != Standards::CPP03));
     const bool printWarnings = mSettings->severity.isEnabled(Severity::warning);
 
     if (!styleC99 && !printWarnings && !mSettings->isPremiumEnabled("wrongmathcall"))
diff --git a/lib/checktype.cpp b/lib/checktype.cpp
index 8a23b8e4f41..0cc91ac8976 100644
--- a/lib/checktype.cpp
+++ b/lib/checktype.cpp
@@ -133,7 +133,7 @@ void CheckType::tooBigSignedBitwiseShiftError(const Token *tok, int lhsbits, con
 {
     constexpr char id[] = "shiftTooManyBitsSigned";
 
-    const bool cpp14 = mSettings->standards.cpp >= Standards::CPP14;
+    const bool cpp14 = ((tok && tok->isCpp()) || (mTokenizer && mTokenizer->isCPP())) && (mSettings->standards.cpp >= Standards::CPP14);
 
     std::string behaviour = "undefined";
     if (cpp14)
diff --git a/lib/symboldatabase.cpp b/lib/symboldatabase.cpp
index 793ef1375be..0fc1e54a830 100644
--- a/lib/symboldatabase.cpp
+++ b/lib/symboldatabase.cpp
@@ -1536,7 +1536,7 @@ void SymbolDatabase::createSymbolDatabaseIncompleteVars()
         // TODO: handle all C/C++ standards
         if (cppkeywords.count(tok->str()) > 0)
             continue;
-        if (mSettings.standards.cpp >= Standards::CPP20 && cpp20keywords.count(tok->str()) > 0)
+        if (tok->isCpp() && (mSettings.standards.cpp >= Standards::CPP20) && cpp20keywords.count(tok->str()) > 0)
             continue;
         std::string fstr = tok->str();
         const Token* ftok = tok->previous();
@@ -3645,7 +3645,7 @@ void SymbolDatabase::debugMessage(const Token *tok, const std::string &type, con
 
 void SymbolDatabase::returnImplicitIntError(const Token *tok) const
 {
-    if (tok && mSettings.severity.isEnabled(Severity::portability) && mSettings.standards.c != Standards::C89 && mErrorLogger) {
+    if (tok && mSettings.severity.isEnabled(Severity::portability) && (tok->isC() && mSettings.standards.c != Standards::C89) && mErrorLogger) {
         const std::list<const Token*> locationList(1, tok);
         const ErrorMessage errmsg(locationList, &mTokenizer.list,
                                   Severity::portability,
@@ -4968,7 +4968,7 @@ const Token *Scope::checkVariable(const Token *tok, AccessControl varaccess, con
     const Token *typestart = tok;
 
     // C++17 structured bindings
-    if (settings.standards.cpp >= Standards::CPP17 && Token::Match(tok, "auto &|&&| [")) {
+    if (tok && tok->isCpp() && (settings.standards.cpp >= Standards::CPP17) && Token::Match(tok, "auto &|&&| [")) {
         const Token *typeend = Token::findsimplematch(typestart, "[")->previous();
         for (tok = typeend->tokAt(2); Token::Match(tok, "%name%|,"); tok = tok->next()) {
             if (tok->varId())
diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 56d1bcd5728..be28c810217 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -5759,10 +5759,9 @@ bool Tokenizer::simplifyTokenList1(const char FileName[])
     // Remove redundant parentheses
     simplifyRedundantParentheses();
 
-    if (isCPP())
+    if (isCPP()) {
         simplifyTypeIntrinsics();
 
-    if (!isC()) {
         // Handle templates..
         if (mTimerResults) {
             Timer t("Tokenizer::simplifyTokens1::simplifyTokenList1::simplifyTemplates", mSettings.showtime, mTimerResults);
@@ -7003,7 +7002,7 @@ void Tokenizer::simplifyVarDecl(const bool only_k_r_fpar)
 
 void Tokenizer::simplifyVarDecl(Token * tokBegin, const Token * const tokEnd, const bool only_k_r_fpar)
 {
-    const bool isCPP11  = mSettings.standards.cpp >= Standards::CPP11;
+    const bool isCPP11 = isCPP() && (mSettings.standards.cpp >= Standards::CPP11);
 
     // Split up variable declarations..
     // "int a=4;" => "int a; a=4;"
@@ -8445,7 +8444,7 @@ void Tokenizer::findGarbageCode() const
             if (!Token::Match(tok->next(), "( !!)"))
                 syntaxError(tok);
             if (tok->str() != "for") {
-                if (isGarbageExpr(tok->next(), tok->linkAt(1), mSettings.standards.cpp>=Standards::cppstd_t::CPP17))
+                if (isGarbageExpr(tok->next(), tok->linkAt(1), isCPP() && (mSettings.standards.cpp>=Standards::cppstd_t::CPP17)))
                     syntaxError(tok);
             }
         }
@@ -9134,7 +9133,7 @@ void Tokenizer::simplifyCppcheckAttribute()
 
 void Tokenizer::simplifyCPPAttribute()
 {
-    if (mSettings.standards.cpp < Standards::CPP11 || isC())
+    if (!isCPP() || mSettings.standards.cpp < Standards::CPP11)
         return;
 
     for (Token *tok = list.front(); tok;) {