diff --git third_party/blink/renderer/platform/heap/thread_local.h third_party/blink/renderer/platform/heap/thread_local.h
index a672ba785ac06..13d794dc15c16 100644
--- third_party/blink/renderer/platform/heap/thread_local.h
+++ third_party/blink/renderer/platform/heap/thread_local.h
@@ -37,7 +37,7 @@
 #if BLINK_HEAP_HIDE_THREAD_LOCAL_IN_LIBRARY
 #define BLINK_HEAP_THREAD_LOCAL_MODEL "local-dynamic"
 #else
-#if BUILDFLAG(IS_WIN)
+#if BUILDFLAG(IS_WIN) || (BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_MAC))
 #define BLINK_HEAP_THREAD_LOCAL_MODEL "initial-exec"
 #elif BUILDFLAG(IS_ANDROID)
 #define BLINK_HEAP_THREAD_LOCAL_MODEL "local-dynamic"