diff --git a/lib/std/coff.zig b/lib/std/coff.zig
index 3890151d09..c6d7660f8b 100644
--- a/lib/std/coff.zig
+++ b/lib/std/coff.zig
@@ -179,7 +179,7 @@ pub const Coff = struct {
         if (byte != 0 and i == buffer.len)
             return error.NameTooLong;
 
-        return i;
+        return @as(usize, i);
     }
 
     pub fn loadSections(self: *Coff) !void {