diff --git a/src/preprocessor.cpp b/src/preprocessor.cpp
index 97280d985..559e62b1b 100644
--- a/src/preprocessor.cpp
+++ b/src/preprocessor.cpp
@@ -1656,7 +1656,6 @@ std::string Preprocessor::expandMacros(std::string code, const std::string &file
             }
 
             // Matching the macroname?
-            const std::string substr(code.substr(pos1, macro.name().length()));
             if (code.compare(pos1, macro.name().length(), macro.name()) != 0)
                 continue;