diff --git a/lib/std/zig/ErrorBundle.zig b/lib/std/zig/ErrorBundle.zig
index 31a706b8e4..141cdb1195 100644
--- a/lib/std/zig/ErrorBundle.zig
+++ b/lib/std/zig/ErrorBundle.zig
@@ -421,7 +421,7 @@ pub const Wip = struct {
         _ = try addExtra(wip, rt);
     }
 
-    pub fn addBundle(wip: *Wip, other: ErrorBundle) !void {
+    pub fn addBundleAsNotes(wip: *Wip, other: ErrorBundle) !void {
         const gpa = wip.gpa;
 
         try wip.string_bytes.ensureUnusedCapacity(gpa, other.string_bytes.len);
@@ -436,6 +436,21 @@ pub const Wip = struct {
         }
     }
 
+    pub fn addBundleAsRoots(wip: *Wip, other: ErrorBundle) !void {
+        const gpa = wip.gpa;
+
+        try wip.string_bytes.ensureUnusedCapacity(gpa, other.string_bytes.len);
+        try wip.extra.ensureUnusedCapacity(gpa, other.extra.len);
+
+        const other_list = other.getMessages();
+
+        try wip.root_list.ensureUnusedCapacity(gpa, other_list.len);
+        for (other_list) |other_msg| {
+            // The ensureUnusedCapacity calls above guarantees this.
+            wip.root_list.appendAssumeCapacity(wip.addOtherMessage(other, other_msg) catch unreachable);
+        }
+    }
+
     pub fn reserveNotes(wip: *Wip, notes_len: u32) !u32 {
         try wip.extra.ensureUnusedCapacity(wip.gpa, notes_len +
             notes_len * @typeInfo(ErrorBundle.ErrorMessage).Struct.fields.len);
diff --git a/src/Compilation.zig b/src/Compilation.zig
index 0150d615e3..14247978d8 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -2683,7 +2683,7 @@ pub fn getAllErrorsAlloc(self: *Compilation) !ErrorBundle {
             .msg = try bundle.addString(value.msg),
             .notes_len = if (value.children) |b| b.errorMessageCount() else 0,
         });
-        if (value.children) |b| try bundle.addBundle(b);
+        if (value.children) |b| try bundle.addBundleAsNotes(b);
     }
     if (self.alloc_failure_occurred) {
         try bundle.addRootErrorMessage(.{