diff --git a/silkaj/cert.py b/silkaj/cert.py
index 4f4a010d4d5906c98c35530c9c01fdd3e5870237..ac051dfe1dd20dd9527bec5484c06b82be8c9e4c 100644
--- a/silkaj/cert.py
+++ b/silkaj/cert.py
@@ -104,7 +104,7 @@ def pre_checks(client, issuer_pubkey, pubkey_to_certify):
     # Check if the certification is already in the pending certifications
     for pending_cert in req["pendingCerts"]:
         if pending_cert["from"] == issuer_pubkey:
-            sys.exit("Certification is currently been processed")
+            sys.exit("Certification is currently being processed")
     return issuer