diff --git a/ogc/bblocks/validation/rdf.py b/ogc/bblocks/validation/rdf.py
index b939493..daa9b24 100644
--- a/ogc/bblocks/validation/rdf.py
+++ b/ogc/bblocks/validation/rdf.py
@@ -143,7 +143,7 @@ def _load_graph(self, filename: Path, output_filename: Path, report: ValidationR
                 ))
                 return
 
-            if not self.jsonld_context and not self.prefixes:
+            if not self.jsonld_context and not prefixes:
                 return
 
             report.add_entry(ValidationReportEntry(