diff --git a/seqerakit/seqeraplatform.py b/seqerakit/seqeraplatform.py
index 4248ea9..8aa3773 100644
--- a/seqerakit/seqeraplatform.py
+++ b/seqerakit/seqeraplatform.py
@@ -114,7 +114,7 @@ def _check_env_vars(self, command):
             if "$" in arg or "%" in arg:
                 processed_arg = arg
 
-                for (pattern, extractor) in env_var_patterns.values():
+                for pattern, extractor in env_var_patterns.values():
                     for env_var in re.findall(pattern, arg):
                         var_name = extractor(env_var)