diff --git a/dr.botzo.py b/dr.botzo.py
index 9ede43e..1c6b016 100644
--- a/dr.botzo.py
+++ b/dr.botzo.py
@@ -72,7 +72,7 @@ try:
             # need to create the drbotzo_modules table
             query = """
                 CREATE TABLE drbotzo_modules (
-                    module TEXT,
+                    module TEXT PRIMARY KEY,
                     version INTEGER
                 )
             """