diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index f5ec8d7b5..f5bde4a46 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -345,7 +345,7 @@ void Tokenizer::createTokens(std::istream &code)
             else if (ch=='&' && CurrentToken.empty() && code.peek() == '&')
             {
                 // &&
-                ch = code.get();
+                ch = (char)code.get();
                 addtoken("&&", lineno, FileIndex, true);
                 continue;
             }