diff --git a/src/sql/operator.rs b/src/sql/operator.rs
index 3116ca6f..f5927e84 100644
--- a/src/sql/operator.rs
+++ b/src/sql/operator.rs
@@ -78,15 +78,15 @@ impl fmt::Display for Operator {
 			Operator::MoreThan => write!(f, ">"),
 			Operator::MoreThanOrEqual => write!(f, ">="),
 			Operator::Contain => write!(f, "CONTAINS"),
-			Operator::NotContain => write!(f, "∌"),
-			Operator::ContainAll => write!(f, "⊇"),
-			Operator::ContainSome => write!(f, "⊃"),
-			Operator::ContainNone => write!(f, "⊅"),
+			Operator::NotContain => write!(f, "CONTAINS NOT"),
+			Operator::ContainAll => write!(f, "CONTAINS ALL"),
+			Operator::ContainSome => write!(f, "CONTAINS SOME"),
+			Operator::ContainNone => write!(f, "CONTAINS NONE"),
 			Operator::Inside => write!(f, "INSIDE"),
-			Operator::NotInside => write!(f, "∉"),
-			Operator::AllInside => write!(f, "⊆"),
-			Operator::SomeInside => write!(f, "⊂"),
-			Operator::NoneInside => write!(f, "⊄"),
+			Operator::NotInside => write!(f, "NOT INSIDE"),
+			Operator::AllInside => write!(f, "ALL INSIDE"),
+			Operator::SomeInside => write!(f, "SOME INSIDE"),
+			Operator::NoneInside => write!(f, "NONE INSIDE"),
 			Operator::Intersects => write!(f, "INTERSECTS"),
 		}
 	}