diff --git a/compiler/modules/col_cap_bitcell_1port.py b/compiler/modules/col_cap_bitcell_1port.py
index 71261a0f..733a6a86 100644
--- a/compiler/modules/col_cap_bitcell_1port.py
+++ b/compiler/modules/col_cap_bitcell_1port.py
@@ -20,3 +20,10 @@ class col_cap_bitcell_1port(bitcell_base):
         debug.info(2, "Create col_cap bitcell 1 port object")
 
         self.no_instances = True
+
+    def build_graph(self, graph, inst_name, port_nets):
+        """
+        Adds edges based on inputs/outputs.
+        Overrides base class function.
+        """
+        pass
diff --git a/compiler/modules/col_cap_bitcell_2port.py b/compiler/modules/col_cap_bitcell_2port.py
index 4fd1941c..c7ece7d8 100644
--- a/compiler/modules/col_cap_bitcell_2port.py
+++ b/compiler/modules/col_cap_bitcell_2port.py
@@ -20,3 +20,10 @@ class col_cap_bitcell_2port(bitcell_base):
         debug.info(2, "Create col_cap bitcell 2 port object")
 
         self.no_instances = True
+
+    def build_graph(self, graph, inst_name, port_nets):
+        """
+        Adds edges based on inputs/outputs.
+        Overrides base class function.
+        """
+        pass
diff --git a/compiler/modules/row_cap_bitcell_1port.py b/compiler/modules/row_cap_bitcell_1port.py
index 9a60a414..09b89737 100644
--- a/compiler/modules/row_cap_bitcell_1port.py
+++ b/compiler/modules/row_cap_bitcell_1port.py
@@ -20,3 +20,10 @@ class row_cap_bitcell_1port(bitcell_base):
         debug.info(2, "Create row_cap bitcell 1 port object")
 
         self.no_instances = True
+
+    def build_graph(self, graph, inst_name, port_nets):
+        """
+        Adds edges based on inputs/outputs.
+        Overrides base class function.
+        """
+        pass
diff --git a/compiler/modules/row_cap_bitcell_2port.py b/compiler/modules/row_cap_bitcell_2port.py
index 88134292..63f9af84 100644
--- a/compiler/modules/row_cap_bitcell_2port.py
+++ b/compiler/modules/row_cap_bitcell_2port.py
@@ -20,3 +20,10 @@ class row_cap_bitcell_2port(bitcell_base):
         debug.info(2, "Create row_cap bitcell 2 port object")
 
         self.no_instances = True
+
+    def build_graph(self, graph, inst_name, port_nets):
+        """
+        Adds edges based on inputs/outputs.
+        Overrides base class function.
+        """
+        pass