diff --git a/lib/checkmemoryleak.cpp b/lib/checkmemoryleak.cpp
index 5b7c1508c..ceecacdf5 100644
--- a/lib/checkmemoryleak.cpp
+++ b/lib/checkmemoryleak.cpp
@@ -455,7 +455,7 @@ void CheckMemoryLeakInFunction::parse_noreturn()
             tok = tok->link();
         if (tok->str() == "(")
         {
-            const std::string function_name((tok->previous() && tok->previous()->isName()) ? tok->strAt(-1) : "");
+            const std::string function_name((tok->previous() && tok->previous()->isName()) ? tok->strAt(-1).c_str() : "");
 
             tok = tok->link();
 
diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 6cd818386..509b415ed 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -4801,8 +4801,8 @@ bool Tokenizer::simplifyCalculations()
             MathLib::isInt(tok->str()) &&
             MathLib::isInt(tok->tokAt(2)->str()))
         {
-            const std::string prev(tok->previous() ? tok->strAt(-1) : "");
-            const std::string after(tok->tokAt(3) ? tok->strAt(3) : "");
+            const std::string prev(tok->previous() ? tok->strAt(-1).c_str() : "");
+            const std::string after(tok->tokAt(3) ? tok->strAt(3).c_str() : "");
             if ((prev == "(" || prev == "&&" || prev == "||") && (after == ")" || after == "&&" || after == "||"))
             {
                 const int op1(MathLib::toLongNumber(tok->str()));