diff --git a/synthDC/scripts/synth.tcl b/synthDC/scripts/synth.tcl
index 1e6591075..36a72302b 100755
--- a/synthDC/scripts/synth.tcl
+++ b/synthDC/scripts/synth.tcl
@@ -105,8 +105,7 @@ set_critical_range [expr $my_period*0.05] $current_design
 
 # Partitioning - flatten or hierarchically synthesize
 if { $maxopt == 1 } {
-    ungroup -all -simple_names
-    # -flatten 
+    ungroup -all -simple_names -flatten 
 }
 
 # Set input pins except clock