diff --git a/include/xo/parser/parser.hpp b/include/xo/parser/parser.hpp
index 99117193..4d45f6e7 100644
--- a/include/xo/parser/parser.hpp
+++ b/include/xo/parser/parser.hpp
@@ -237,7 +237,7 @@ namespace xo {
                                  exprstatestack * p_stack,
                                  rp<Expression> * p_emit_expr);
             void on_colon(exprstatestack * p_stack);
-            expraction on_singleassign(exprstatestack * p_stack);
+            void on_singleassign(exprstatestack * p_stack);
             void on_f64(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 98baccfc..a1ee3ae2 100644
--- a/src/parser/parser.cpp
+++ b/src/parser/parser.cpp
@@ -380,7 +380,7 @@ namespace xo {
             }
         }
 
-        expraction
+        void
         exprstate::on_singleassign(exprstatestack * p_stack) {
             constexpr bool c_debug_flag = true;
             scope log(XO_DEBUG(c_debug_flag));
@@ -398,11 +398,8 @@ namespace xo {
                 this->exs_type_ = exprstatetype::def_4;
 
                 p_stack->push_exprstate(exprstatetype::expect_rhs_expression);
-
-                return expraction::keep();
             } else {
                 assert(false);
-                return expraction();
             }
         }