diff --git a/doc/langref/grammar.peg b/doc/langref/grammar.peg
index ad2433cbffd70c7739aecd7ae1ad0c1ea1673854..d78765560e548dec404fb1378952ef9a42a65676 100644
--- a/doc/langref/grammar.peg
+++ b/doc/langref/grammar.peg
@@ -64,7 +64,7 @@ DeclPrefix
      / KEYWORD_extern STRINGLITERALSINGLE? KEYWORD_fn
      / (KEYWORD_export / KEYWORD_extern STRINGLITERALSINGLE?)? KEYWORD_threadlocal? (KEYWORD_const / KEYWORD_var)
 
-FnProto <- KEYWORD_fn IDENTIFIER? LPAREN ParamDeclList RPAREN ByteAlign? AddrSpace? LinkSection? CallConv? EXCLAMATIONMARK? TypeExpr
+FnProto <- KEYWORD_fn IDENTIFIER? ParamDeclList ByteAlign? AddrSpace? LinkSection? CallConv? EXCLAMATIONMARK? TypeExpr
 
 VarDeclProto <- (KEYWORD_const / KEYWORD_var) IDENTIFIER (COLON TypeExpr)? ByteAlign? AddrSpace? LinkSection?
 
@@ -448,7 +448,11 @@ AsmOutputList <- (AsmOutputItem COMMA)* AsmOutputItem?
 
 AsmInputList <- (AsmInputItem COMMA)* AsmInputItem?
 
-ParamDeclList <- (ParamDecl COMMA)* (ParamDecl / DOT3 COMMA?)?
+ParamDeclList <- LPAREN ParamDeclListRest
+ParamDeclListRest
+    <- RPAREN
+     / DOT3 COMMA? RPAREN
+     / ParamDecl (COMMA ParamDeclListRest / RPAREN)
 
 ExprList <- (Expr COMMA)* (Expr / !ExprPrefix)
 
diff --git a/lib/std/zig/parser_generated_oracle.zig b/lib/std/zig/parser_generated_oracle.zig
index 20366362b5c28029031d3e4c76da8ac5b60aefaf..f1427bd6101e09695c1dae7329d64b508ece9f5f 100644
--- a/lib/std/zig/parser_generated_oracle.zig
+++ b/lib/std/zig/parser_generated_oracle.zig
@@ -203,7 +203,7 @@ const Parser = struct {
     pub fn parseFnProto(p: *Parser) Error!bool {
         return blk_0: {
             const pos_0 = p.i;
-            if (try p.parseKEYWORD_fn() and (try p.parseIDENTIFIER() or true) and try p.parseLPAREN() and try p.parseParamDeclList() and try p.parseRPAREN() and (try p.parseByteAlign() or true) and (try p.parseAddrSpace() or true) and (try p.parseLinkSection() or true) and (try p.parseCallConv() or true) and (try p.parseEXCLAMATIONMARK() or true) and try p.parseTypeExpr()) break :blk_0 true;
+            if (try p.parseKEYWORD_fn() and (try p.parseIDENTIFIER() or true) and try p.parseParamDeclList() and (try p.parseByteAlign() or true) and (try p.parseAddrSpace() or true) and (try p.parseLinkSection() or true) and (try p.parseCallConv() or true) and (try p.parseEXCLAMATIONMARK() or true) and try p.parseTypeExpr()) break :blk_0 true;
             p.i = pos_0;
             break :blk_0 false;
         };
@@ -2286,26 +2286,26 @@ const Parser = struct {
     pub fn parseParamDeclList(p: *Parser) Error!bool {
         return blk_0: {
             const pos_0 = p.i;
-            if (blk_1: {
-                var i_1: usize = 0;
-                while (blk_3: {
-                    const pos_3 = p.i;
-                    if (try p.parseParamDecl() and try p.parseCOMMA()) break :blk_3 true;
-                    p.i = pos_3;
-                    break :blk_3 false;
-                }) {
-                    if (i_1 > max_depth) return error.MaxDepth;
-                    i_1 += 1;
-                }
-                break :blk_1 true;
-            } and (blk_3: {
-                const pos_3 = p.i;
-                if (try p.parseParamDecl()) break :blk_3 true;
-                p.i = pos_3;
-                if (try p.parseDOT3() and (try p.parseCOMMA() or true)) break :blk_3 true;
-                p.i = pos_3;
-                break :blk_3 false;
-            } or true)) break :blk_0 true;
+            if (try p.parseLPAREN() and try p.parseParamDeclListRest()) break :blk_0 true;
+            p.i = pos_0;
+            break :blk_0 false;
+        };
+    }
+    pub fn parseParamDeclListRest(p: *Parser) Error!bool {
+        return blk_0: {
+            const pos_0 = p.i;
+            if (try p.parseRPAREN()) break :blk_0 true;
+            p.i = pos_0;
+            if (try p.parseDOT3() and (try p.parseCOMMA() or true) and try p.parseRPAREN()) break :blk_0 true;
+            p.i = pos_0;
+            if (try p.parseParamDecl() and blk_2: {
+                const pos_2 = p.i;
+                if (try p.parseCOMMA() and try p.parseParamDeclListRest()) break :blk_2 true;
+                p.i = pos_2;
+                if (try p.parseRPAREN()) break :blk_2 true;
+                p.i = pos_2;
+                break :blk_2 false;
+            }) break :blk_0 true;
             p.i = pos_0;
             break :blk_0 false;
         };