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-rw-r--r--grc/core/schema_checker/block.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/grc/core/schema_checker/block.py b/grc/core/schema_checker/block.py
index ea079b4276..d511e36887 100644
--- a/grc/core/schema_checker/block.py
+++ b/grc/core/schema_checker/block.py
@@ -37,7 +37,7 @@ TEMPLATES_SCHEME = expand(
BLOCK_SCHEME = expand(
id=Spec(types=str_, required=True, item_scheme=None),
label=str_,
- category=(list, str_),
+ category=str_,
flags=(list, str_),
parameters=Spec(types=list, required=False, item_scheme=PARAM_SCHEME),