diff --git a/lib/std/tar.zig b/lib/std/tar.zig
index 15727fdebf..c39cc6e432 100644
--- a/lib/std/tar.zig
+++ b/lib/std/tar.zig
@@ -82,7 +82,7 @@ pub const Header = struct {
 
     pub fn fileSize(header: Header) !u64 {
         const raw = header.bytes[124..][0..12];
-        const ltrimmed = std.mem.trimLeft(u8, raw, "0");
+        const ltrimmed = std.mem.trimLeft(u8, raw, "0 ");
         const rtrimmed = std.mem.trimRight(u8, ltrimmed, " \x00");
         if (rtrimmed.len == 0) return 0;
         return std.fmt.parseInt(u64, rtrimmed, 8);