diff --git a/lib/std/zig/Ast.zig b/lib/std/zig/Ast.zig
index f99d58aafa..cb86696e13 100644
--- a/lib/std/zig/Ast.zig
+++ b/lib/std/zig/Ast.zig
@@ -1407,7 +1407,8 @@ pub fn containerField(tree: Ast, node: Node.Index) full.ContainerField {
         .type_expr = data.lhs,
         .value_expr = extra.value_expr,
         .align_expr = extra.align_expr,
-        .tuple_like = tree.tokens.items(.tag)[main_token + 1] != .colon,
+        .tuple_like = tree.tokens.items(.tag)[main_token] != .identifier or
+            tree.tokens.items(.tag)[main_token + 1] != .colon,
     });
 }
 
@@ -1420,7 +1421,8 @@ pub fn containerFieldInit(tree: Ast, node: Node.Index) full.ContainerField {
         .type_expr = data.lhs,
         .value_expr = data.rhs,
         .align_expr = 0,
-        .tuple_like = tree.tokens.items(.tag)[main_token + 1] != .colon,
+        .tuple_like = tree.tokens.items(.tag)[main_token] != .identifier or
+            tree.tokens.items(.tag)[main_token + 1] != .colon,
     });
 }
 
@@ -1433,7 +1435,8 @@ pub fn containerFieldAlign(tree: Ast, node: Node.Index) full.ContainerField {
         .type_expr = data.lhs,
         .value_expr = 0,
         .align_expr = data.rhs,
-        .tuple_like = tree.tokens.items(.tag)[main_token + 1] != .colon,
+        .tuple_like = tree.tokens.items(.tag)[main_token] != .identifier or
+            tree.tokens.items(.tag)[main_token + 1] != .colon,
     });
 }
 
diff --git a/test/behavior/tuple.zig b/test/behavior/tuple.zig
index 13b02b40e8..f7860be34e 100644
--- a/test/behavior/tuple.zig
+++ b/test/behavior/tuple.zig
@@ -397,3 +397,22 @@ test "nested runtime conditionals in tuple initializer" {
     };
     try expectEqualStrings("up", x[0]);
 }
+
+test "sentinel slice in tuple with other fields" {
+    const S = struct {
+        a: u32,
+        b: u32,
+    };
+
+    const Submission = union(enum) {
+        open: struct { *S, [:0]const u8, u32 },
+    };
+
+    _ = Submission;
+}
+
+test "sentinel slice in tuple" {
+    const S = struct { [:0]const u8 };
+
+    _ = S;
+}