diff --git a/scripts/gen_gpio_defaults.py b/scripts/gen_gpio_defaults.py
index 5f045ebf..a108c349 100755
--- a/scripts/gen_gpio_defaults.py
+++ b/scripts/gen_gpio_defaults.py
@@ -66,6 +66,7 @@
 import os
 import sys
 import re
+import glob
 import subprocess
 
 def usage():
@@ -211,6 +212,12 @@ def usage():
 
     cellsused = [None] * 38
 
+    # Remove pre-existing versions of mag and verilog files because they may be out-of-date.
+    for old_mag_file in glob.glob(magpath + '/gpio_defaults_block_*.mag'):
+        os.remove(old_mag_file)
+    for old_verilog_file in glob.glob(glpath + '/gpio_defaults_block_*.v'):
+        os.remove(old_verilog_file)
+
     for i in range(0, 38):
         config_name = '`USER_CONFIG_GPIO_' + str(i) + '_INIT'
         try: