diff --git a/compiler/base/design.py b/compiler/base/design.py
index 5a87dd79..516eef80 100644
--- a/compiler/base/design.py
+++ b/compiler/base/design.py
@@ -28,7 +28,8 @@ class design(hierarchy_design):
 
         self.m1_pitch = max(contact.m1m2.width,contact.m1m2.height) + max(self.m1_space, self.m2_space)
         self.m2_pitch = max(contact.m2m3.width,contact.m2m3.height) + max(self.m2_space, self.m3_space)
-        self.m3_pitch = max(contact.m3m4.width,contact.m3m4.height) + max(self.m3_space, self.m4_space)
+        if contact.m3m4:
+            self.m3_pitch = max(contact.m3m4.width,contact.m3m4.height) + max(self.m3_space, self.m4_space)
 
     def setup_drc_constants(self):
         """ These are some DRC constants used in many places in the compiler."""
@@ -42,8 +43,9 @@ class design(hierarchy_design):
         self.m2_space = drc("metal2_to_metal2")        
         self.m3_width = drc("minwidth_metal3")
         self.m3_space = drc("metal3_to_metal3")
-        self.m4_width = drc("minwidth_metal4")
-        self.m4_space = drc("metal4_to_metal4")
+        if contact.m3m4:
+            self.m4_width = drc("minwidth_metal4")
+            self.m4_space = drc("metal4_to_metal4")
         self.active_width = drc("minwidth_active")
         self.active_space = drc("active_to_body_active")
         self.contact_width = drc("minwidth_contact")