diff --git a/crates/squawk_parser/src/generated/syntax_kind.rs b/crates/squawk_parser/src/generated/syntax_kind.rs
index 797ed233..c0180845 100644
--- a/crates/squawk_parser/src/generated/syntax_kind.rs
+++ b/crates/squawk_parser/src/generated/syntax_kind.rs
@@ -847,6 +847,7 @@ pub enum SyntaxKind {
     NAME_REF,
     NEQ,
     NEQB,
+    NON_STANDARD_PARAM,
     NOTIFY,
     NOT_DEFERRABLE,
     NOT_DEFERRABLE_CONSTRAINT_OPTION,
diff --git a/crates/squawk_parser/src/grammar.rs b/crates/squawk_parser/src/grammar.rs
index 8d005139..7e48425f 100644
--- a/crates/squawk_parser/src/grammar.rs
+++ b/crates/squawk_parser/src/grammar.rs
@@ -1254,6 +1254,11 @@ fn lhs(p: &mut Parser<'_>, r: &Restrictions) -> Option<CompletedMarker> {
             p.bump_any();
             (PREFIX_EXPR, 13)
         }
+        COLON => {
+            m = p.start();
+            p.bump(COLON);
+            (NON_STANDARD_PARAM, 7)
+        }
         _ if p.at_ts(OPERATOR_FIRST) && p.at(CUSTOM_OP) => {
             m = p.start();
             p.bump(CUSTOM_OP);
diff --git a/crates/squawk_syntax/src/ast/generated/nodes.rs b/crates/squawk_syntax/src/ast/generated/nodes.rs
index d23f0af2..b9ed84a3 100644
--- a/crates/squawk_syntax/src/ast/generated/nodes.rs
+++ b/crates/squawk_syntax/src/ast/generated/nodes.rs
@@ -6310,6 +6310,21 @@ impl NoInherit {
     }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct NonStandardParam {
+    pub(crate) syntax: SyntaxNode,
+}
+impl NonStandardParam {
+    #[inline]
+    pub fn name_ref(&self) -> Option<NameRef> {
+        support::child(&self.syntax)
+    }
+    #[inline]
+    pub fn colon_token(&self) -> Option<SyntaxToken> {
+        support::token(&self.syntax, SyntaxKind::COLON)
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct NotDeferrable {
     pub(crate) syntax: SyntaxNode,
@@ -15481,6 +15496,24 @@ impl AstNode for NoInherit {
         &self.syntax
     }
 }
+impl AstNode for NonStandardParam {
+    #[inline]
+    fn can_cast(kind: SyntaxKind) -> bool {
+        kind == SyntaxKind::NON_STANDARD_PARAM
+    }
+    #[inline]
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    #[inline]
+    fn syntax(&self) -> &SyntaxNode {
+        &self.syntax
+    }
+}
 impl AstNode for NotDeferrable {
     #[inline]
     fn can_cast(kind: SyntaxKind) -> bool {
diff --git a/crates/squawk_syntax/src/postgresql.ungram b/crates/squawk_syntax/src/postgresql.ungram
index 6036c437..384cbf37 100644
--- a/crates/squawk_syntax/src/postgresql.ungram
+++ b/crates/squawk_syntax/src/postgresql.ungram
@@ -928,6 +928,9 @@ PrefixExpr =
 PostfixExpr =
   Expr
 
+NonStandardParam =
+  ':' NameRef
+
 IndexExpr =
   base:Expr '[' index:Expr ']'