diff --git a/jwt/api_jwt.py b/jwt/api_jwt.py
index 48d739ad..60610fdc 100644
--- a/jwt/api_jwt.py
+++ b/jwt/api_jwt.py
@@ -300,7 +300,7 @@ def _validate_exp(
         try:
             exp = int(payload["exp"])
         except ValueError:
-            raise DecodeError("Expiration Time claim (exp) must be an" " integer.")
+            raise DecodeError("Expiration Time claim (exp) must be an integer.")
 
         if exp <= (now - leeway):
             raise ExpiredSignatureError("Signature has expired")