diff --git a/acmetopem.py b/acmetopem.py
index 7e8535e..b7125eb 100644
--- a/acmetopem.py
+++ b/acmetopem.py
@@ -21,7 +21,7 @@ for cert in acmestore.get('Certificates'):
     certbin = cert.get('certificate')
     keybin = cert.get('key')
 
-if not (certbin or keybin):
+if not (certbin and keybin):
     print("Cert not found")
     sys.exit(1)