diff --git a/crates/sqlquack-syntax/src/parser/_helpers/ddl/snowflake_alter_tables.rs b/crates/sqlquack-syntax/src/parser/_helpers/ddl/snowflake_alter_tables.rs
index a24737cb9..052d1e68c 100644
--- a/crates/sqlquack-syntax/src/parser/_helpers/ddl/snowflake_alter_tables.rs
+++ b/crates/sqlquack-syntax/src/parser/_helpers/ddl/snowflake_alter_tables.rs
@@ -174,7 +174,7 @@ impl Parser {
         Ok(Some(alter_object(kind, head, action, parts)))
     }
 
-    /// Parse ALTER SHARE: UNSET COMMENT typed; ADD, REMOVE, SET and UNSET TAG are left to the fallback.
+    /// Parse ALTER SHARE: UNSET COMMENT typed; ADD, REMOVE, SET and other UNSETs are left to the fallback.
     fn parse_alter_share(&mut self) -> Result<Option<Expression>> {
         let start = self.current - 1;
         let head = self.parse_alter_object_head()?;
@@ -186,8 +186,10 @@ impl Parser {
             self.text_at(0).unwrap_or_default().as_str(),
             self.text_at(1).as_deref(),
         ) {
-            ("UNSET", Some("TAG")) | ("ADD" | "REMOVE" | "SET", _) => {}
-            ("UNSET", _) => return Err(self.parse_error("Expected COMMENT or TAG after UNSET")),
+            ("UNSET", None | Some(";")) => {
+                return Err(self.parse_error("Expected a property after UNSET"))
+            }
+            ("ADD" | "REMOVE" | "SET" | "UNSET", _) => {}
             _ => return Err(self.parse_error("Expected ADD, REMOVE, SET or UNSET")),
         }
         self.current = start;
diff --git a/crates/sqlquack-syntax/tests/parser/test_snowflake_alter_gaps.rs b/crates/sqlquack-syntax/tests/parser/test_snowflake_alter_gaps.rs
index 793451abf..95e0cdeb9 100644
--- a/crates/sqlquack-syntax/tests/parser/test_snowflake_alter_gaps.rs
+++ b/crates/sqlquack-syntax/tests/parser/test_snowflake_alter_gaps.rs
@@ -37,7 +37,8 @@ fn given_snowflake_table_sequence_and_share_actions_when_parsing_then_only_docum
         AcceptanceTestCase { description: "a file is no name (recorded syntax error)", sql: "ALTER EXTERNAL TABLE v1 REMOVE FILES ( m1 ) ;", dialect: Dialect::Snowflake, expected_accepted: false },
         AcceptanceTestCase { description: "a share unsets its comment (recorded semantic error)", sql: "ALTER SHARE v1 UNSET COMMENT ;", dialect: Dialect::Snowflake, expected_accepted: true },
         AcceptanceTestCase { description: "a share keeps its ADD action", sql: "ALTER SHARE v1 ADD ACCOUNTS = a1 ;", dialect: Dialect::Snowflake, expected_accepted: true },
-        AcceptanceTestCase { description: "a share unsets COMMENT or TAG only", sql: "ALTER SHARE v1 UNSET m1 ;", dialect: Dialect::Snowflake, expected_accepted: false },
+        AcceptanceTestCase { description: "a share unsets any named property (recorded semantic error 1420)", sql: "ALTER SHARE v1 UNSET v1 ;", dialect: Dialect::Snowflake, expected_accepted: true },
+        AcceptanceTestCase { description: "UNSET names a property (catalogued reject)", sql: "ALTER SHARE v1 UNSET ;", dialect: Dialect::Snowflake, expected_accepted: false },
         AcceptanceTestCase { description: "a user group is an organization user group (recorded syntax error)", sql: "ALTER USER GROUP v1 ADD ORGANIZATION USERS v1 ;", dialect: Dialect::Snowflake, expected_accepted: false },
         AcceptanceTestCase { description: "an organization user group adds users", sql: "ALTER ORGANIZATION USER GROUP IF EXISTS v1 ADD ORGANIZATION USERS v1 , v1 ;", dialect: Dialect::Snowflake, expected_accepted: true },
     ];