diff --git a/Sources/PostgresKit/PostgresDialect.swift b/Sources/PostgresKit/PostgresDialect.swift
index 9cd15a2e..8be3c776 100644
--- a/Sources/PostgresKit/PostgresDialect.swift
+++ b/Sources/PostgresKit/PostgresDialect.swift
@@ -40,4 +40,11 @@ public struct PostgresDialect: SQLDialect {
             drop: [.supportsCascade, .supportsTableName]
         )
     }
+
+    public var alterTableSyntax: SQLAlterTableSyntax {
+        .init(
+            alterColumnDefinitionClause: SQLRaw("ALTER COLUMN"),
+            alterColumnDefinitionTypeKeyword: SQLRaw("SET DATA TYPE")
+        )
+    }
 }