diff --git a/src/main.zig b/src/main.zig
index 4012db6..5c11fb8 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -401,8 +401,22 @@ fn printLong(cmd: Command, writer: anytype) !void {
         var n_size: usize = 0;
         var n_suff: usize = 0;
         for (cmd.entries) |entry| {
-            const group = cmd.getGroup(entry.statx.gid).?;
-            const user = cmd.getUser(entry.statx.uid).?;
+            const group = cmd.getGroup(entry.statx.gid) orelse switch (entry.statx.gid) {
+                0...9 => "1",
+                10...99 => "10",
+                100...999 => "100",
+                1000...9999 => "1000",
+                10000...99999 => "10000",
+                else => "1000000",
+            };
+            const user = cmd.getUser(entry.statx.uid) orelse switch (entry.statx.uid) {
+                0...9 => "1",
+                10...99 => "10",
+                100...999 => "100",
+                1000...9999 => "1000",
+                10000...99999 => "10000",
+                else => "1000000",
+            };
             var buf: [16]u8 = undefined;
             const size = try entry.humanReadableSize(&buf);
             n_group = @max(n_group, group.name.len);
@@ -414,8 +428,10 @@ fn printLong(cmd: Command, writer: anytype) !void {
     };
 
     for (cmd.entries) |entry| {
-        const user = cmd.getUser(entry.statx.uid).?;
-        const group = cmd.getGroup(entry.statx.gid).?;
+        const user = cmd.getUser(entry.statx.uid) orelse
+            try std.fmt.allocPrint(cmd.arena, "{d}", .{entry.statx.uid});
+        const group = cmd.getGroup(entry.statx.gid) orelse
+            try std.fmt.allocPrint(cmd.arena, "{d}", .{entry.statx.gid});
         const ts = @as(i128, entry.statx.mtime.sec) * std.time.ns_per_s;
         const inst: zeit.Instant = .{ .timestamp = ts, .timezone = &tz };
         const time = inst.time();