diff --git a/compiler/globals.py b/compiler/globals.py
index a552163b..206d72a0 100644
--- a/compiler/globals.py
+++ b/compiler/globals.py
@@ -378,7 +378,7 @@ def read_config(config_file, is_unit_test=True):
                                                          OPTS.tech_name)
 
     # If write size is not defined, set it equal to word size
-    if OPTS.write_size == None:
+    if OPTS.write_size is None:
         OPTS.write_size = OPTS.word_size