diff --git a/src/SymbolTable.hh b/src/SymbolTable.hh
index fb41bb89..908914a5 100644
--- a/src/SymbolTable.hh
+++ b/src/SymbolTable.hh
@@ -33,8 +33,6 @@
 
 using namespace std;
 
-using expr_t = class ExprNode*;
-
 //! Types of auxiliary variables
 enum class AuxVarType
 {