diff --git a/buildCore.js b/buildCore.js
index 0313e805..69821aa0 100644
--- a/buildCore.js
+++ b/buildCore.js
@@ -6,7 +6,7 @@ let profile = "debug";
 let cargoFlags = "";
 // Keep .github/workflows/ci.yml in sync with these flags, so wasm-opt works.
 let rustFlags =
-    "-C target-feature=+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,+simd128,+extended-const,+multivalue,+reference-types";
+    "-C target-feature=+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext,+simd128,+extended-const,+multivalue,+reference-types,+tail-call";
 let wasmBindgenFlags = "--encode-into always --target web --reference-types";
 let target = "wasm32-unknown-unknown";
 let targetFolder = target;
@@ -28,9 +28,6 @@ if (process.argv.some((v) => v === "--max-opt")) {
 if (process.argv.some((v) => v === "--unstable")) {
     // Relaxed SIMD is not supported by Firefox and Safari yet.
     rustFlags += ",+relaxed-simd";
-
-    // Tail calls are not supported by Safari yet until 18.2 (early December).
-    rustFlags += ",+tail-call";
 }
 
 // Use the nightly toolchain, which enables some more optimizations.