diff --git a/build.zig b/build.zig
index 0bd1abe03359bdd5c84086c95286568022a53bc4..74ef42a775985c90dd8a5b6b80a0926e4bc6012b 100644
--- a/build.zig
+++ b/build.zig
@@ -763,9 +763,8 @@ fn addWasiUpdateStep(b: *std.Build, version: [:0]const u8) !void {
         .optimize = .ReleaseSmall,
         .target = b.resolveTargetQuery(std.Target.Query.parse(.{
             .arch_os_abi = "wasm32-wasi",
-            // * `extended_const` is not supported by the `wasm-opt` version in CI.
             // * `nontrapping_bulk_memory_len0` is supported by `wasm2c`.
-            .cpu_features = "baseline-extended_const+nontrapping_bulk_memory_len0",
+            .cpu_features = "baseline+nontrapping_bulk_memory_len0",
         }) catch unreachable),
     });
 
@@ -809,6 +808,7 @@ fn addWasiUpdateStep(b: *std.Build, version: [:0]const u8) !void {
         "-Oz",
         "--enable-bulk-memory",
         "--enable-mutable-globals",
+        "--enable-extended-const",
         "--enable-nontrapping-float-to-int",
         "--enable-sign-ext",
     });