diff --git a/elab_scope.cc b/elab_scope.cc
index 295597e46..69afc212a 100644
--- a/elab_scope.cc
+++ b/elab_scope.cc
@@ -150,19 +150,6 @@ static void elaborate_parm_item_(perm_string name,
 	    return;
       }
 
-      if (signed_flag) {
-	      /* If explicitly signed, then say so. */
-	    val->cast_signed(true);
-      } else if (cur.msb) {
-	      /* If there is a range, then the signedness comes
-		 from the type and not the expression. */
-	    val->cast_signed(signed_flag);
-      } else {
-	      /* otherwise, let the expression describe
-		 itself. */
-	    signed_flag = val->has_sign();
-      }
-
       val = scope->set_parameter(name, val, cur.type, msb, lsb, signed_flag,
                                  range_list, cur);
       delete val;
diff --git a/net_design.cc b/net_design.cc
index cded937b8..2d56b1bf9 100644
--- a/net_design.cc
+++ b/net_design.cc
@@ -389,10 +389,10 @@ void NetScope::evaluate_parameter_logic_(Design*des, param_ref_t cur)
 	    return;
       }
 
-	/* If the parameter has range information, then make
-	sure the value is set right. Note that if the
-	parameter doesn't have an explicit range, then it
-	will get the signedness from the expression itself. */
+	/* If the parameter has type or range information, then make
+	   sure the type is set right. Note that if the parameter
+	   doesn't have an explicit type or range, then it will get
+	   the signedness from the expression itself. */
       if (range_flag) {
 	    unsigned long wid = (msb >= lsb)? msb - lsb : lsb - msb;
 	    wid += 1;
@@ -420,6 +420,8 @@ void NetScope::evaluate_parameter_logic_(Design*des, param_ref_t cur)
 		  val = new NetEConst(tmp);
 		  (*cur).second.expr = expr = val;
 	    }
+      } else if ((*cur).second.signed_flag) {
+            (*cur).second.expr->cast_signed(true);
       }
 
 	// If there are no value ranges to test the value against,
diff --git a/parse.y b/parse.y
index 076c5788e..003ea90a9 100644
--- a/parse.y
+++ b/parse.y
@@ -2635,6 +2635,16 @@ parameter_assign_decl
 	param_active_signed = false;
 	param_active_type = IVL_VT_LOGIC;
       }
+  | K_signed
+      { param_active_range = 0;
+	param_active_signed = true;
+	param_active_type = IVL_VT_LOGIC;
+      }
+    parameter_assign_list
+      { param_active_range = 0;
+	param_active_signed = false;
+	param_active_type = IVL_VT_LOGIC;
+      }
   | K_signed range
       { param_active_range = $2;
 	param_active_signed = true;
@@ -2764,6 +2774,16 @@ localparam_assign_decl
         param_active_signed = false;
 	param_active_type = IVL_VT_LOGIC;
       }
+  | K_signed
+      { param_active_range = 0;
+	param_active_signed = true;
+	param_active_type = IVL_VT_LOGIC;
+      }
+    localparam_assign_list
+      { param_active_range = 0;
+	param_active_signed = false;
+	param_active_type = IVL_VT_LOGIC;
+      }
   | K_signed range
       { param_active_range = $2;
 	param_active_signed = true;