diff --git a/include/xo/parser/parser.hpp b/include/xo/parser/parser.hpp
index 4d45f6e7..a01b1da2 100644
--- a/include/xo/parser/parser.hpp
+++ b/include/xo/parser/parser.hpp
@@ -232,7 +232,7 @@ namespace xo {
             void print(std::ostream & os) const;
 
         private:
-            expraction on_def(exprstatestack * p_stack);
+            void on_def(exprstatestack * p_stack);
             expraction on_symbol(const token_type & tk,
                                  exprstatestack * p_stack,
                                  rp<Expression> * p_emit_expr);
diff --git a/src/parser/parser.cpp b/src/parser/parser.cpp
index a1ee3ae2..905abfea 100644
--- a/src/parser/parser.cpp
+++ b/src/parser/parser.cpp
@@ -245,7 +245,7 @@ namespace xo {
             }
         }
 
-        expraction
+        void
         exprstate::on_def(exprstatestack * p_stack) {
             constexpr bool c_debug_flag = true;
             scope log(XO_DEBUG(c_debug_flag));
@@ -270,7 +270,6 @@ namespace xo {
              *   def pi : f64 = 3.14159265
              *   def sq(x : f64) -> f64 { (x * x) }
              */
-            return expraction::keep();
         }
 
         expraction