diff --git a/src/SymbolTable.hh b/src/SymbolTable.hh
index fb41bb8950c487c96b593681040ec231b7392165..908914a542dc20d2dfb85b4d1c3950eb2aa8af33 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
 {