diff --git a/src/link/Coff.zig b/src/link/Coff.zig
index 496ba9a76686a9ddd0014cb6aba3ecb642c101c2..5fede2640f4d8056ca5a5e1163b1a6a0ab1ea253 100644
--- a/src/link/Coff.zig
+++ b/src/link/Coff.zig
@@ -5326,7 +5326,7 @@ fn loadArchive(coff: *Coff, path: std.Build.Cache.Path, fr: *Io.File.Reader) Loa
                 });
 
             const ext = ".dll";
-            if (!std.mem.endsWith(u8, lib_name, ext))
+            if (!std.ascii.endsWithIgnoreCase(lib_name, ext))
                 return diags.failParse(
                     path,
                     "unexpected extension for import '{s} ('{s}'): '{s}'",
@@ -5421,7 +5421,7 @@ pub fn prelink(coff: *Coff, prog_node: std.Progress.Node) link.Error!void {
         };
         const search_paths = all_paths[0..if (target.abi == .msvc or target.abi == .itanium) 3 else 1];
         lib: for (coff.pending_default_libs.items) |lib| {
-            if (!std.mem.eql(u8, std.fs.path.extension(lib.path), ".lib"))
+            if (!std.ascii.endsWithIgnoreCase(std.fs.path.extension(lib.path), ".lib"))
                 return comp.link_diags.failParse(
                     lib.ioi.path(coff),
                     "/DEFAULTLIB library '{s}' had unexpected extension",