diff --git a/compiler/characterizer/stimuli.py b/compiler/characterizer/stimuli.py
index fc2a106f..b5a143cf 100644
--- a/compiler/characterizer/stimuli.py
+++ b/compiler/characterizer/stimuli.py
@@ -251,14 +251,16 @@ class stimuli():
 
     def write_include(self, circuit):
         """Writes include statements, inputs are lists of model files"""
-        libraries = self.device_libraries
+
         includes = self.device_models + [circuit]
         self.sf.write("* {} process corner\n".format(self.process))
-        for item in list(libraries):
-            if os.path.isfile(item[0]):
-                self.sf.write(".lib \"{0}\" {1}\n".format(item[0], item[1]))
-            else:
-                debug.error("Could not find spice library: {0}\nSet SPICE_MODEL_DIR to over-ride path.\n".format(item[0]))
+        if OPTS.tech_name == "s8":
+            libraries = self.device_libraries
+            for item in list(libraries):
+                if os.path.isfile(item[0]):
+                    self.sf.write(".lib \"{0}\" {1}\n".format(item[0], item[1]))
+                else:
+                    debug.error("Could not find spice library: {0}\nSet SPICE_MODEL_DIR to over-ride path.\n".format(item[0]))
 
         for item in list(includes):
             if os.path.isfile(item):
diff --git a/compiler/pgates/ptx.py b/compiler/pgates/ptx.py
index ffd61a48..d51f42be 100644
--- a/compiler/pgates/ptx.py
+++ b/compiler/pgates/ptx.py
@@ -109,7 +109,7 @@ class ptx(design.design):
         perimeter_sd = 2 * self.poly_width + 2 * self.tx_width
 
 
-        if OPTS.tech_name == None:
+        if OPTS.tech_name == "s8":
             print("here {0}".format(self.name))
             # s8 technology is in microns
             main_str = "M{{0}} {{1}} {0} m={1} w={2} l={3} ".format(spice[self.tx_type],