diff --git a/Documentation/testcases/material/fail-an_optional_material_fails_if_no_value_matches.ifc b/Documentation/testcases/material/fail-an_optional_material_fails_if_no_value_matches.ifc
index f16fcc2..122b6db 100644
--- a/Documentation/testcases/material/fail-an_optional_material_fails_if_no_value_matches.ifc
+++ b/Documentation/testcases/material/fail-an_optional_material_fails_if_no_value_matches.ifc
@@ -6,7 +6,7 @@ FILE_SCHEMA(('IFC4'));
 ENDSEC;
 DATA;
 #1=IFCWALL('1hqIFTRjfV6AWq_bMtnZwI',$,$,$,$,$,$,$,$);
-#2=IFCMATERIAL("No match",$,$);
+#2=IFCMATERIAL('No match',$,$);
 #3=IFCRELASSOCIATESMATERIAL('05rScmOVzMoQXOfbYdtLYj',$,$,$,(#1),#2);
 ENDSEC;
 END-ISO-10303-21;