diff --git a/src/format/formulas.rs b/src/format/formulas.rs
index 4a131aa..ed6364d 100644
--- a/src/format/formulas.rs
+++ b/src/format/formulas.rs
@@ -86,7 +86,7 @@ fn requires_parentheses<'formula>(formula: &'formula crate::Formula,
 				},
 			_ => false,
 		},
-		Formula::Or(formulas) => match *parent_formula
+		Formula::IfAndOnlyIf(formulas) => match *parent_formula
 		{
 			Formula::Not(_)
 			| Formula::Exists(_)