diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
index 542c4a5..d64a6bd 100644
--- a/libc/bionic/libc_init_common.cpp
+++ b/libc/bionic/libc_init_common.cpp
@@ -42,6 +42,7 @@
 #include <unistd.h>
 
 #include <async_safe/log.h>
+#include <platform/bionic/mte_kernel.h>
 
 #include "private/WriteProtected.h"
 #include "private/bionic_defs.h"
@@ -109,8 +110,18 @@
 #if defined(__aarch64__)
 #define PR_SET_TAGGED_ADDR_CTRL 55
 #define PR_TAGGED_ADDR_ENABLE   (1UL << 0)
+#ifdef ANDROID_EXPERIMENTAL_MTE
+  // First, try enabling MTE in asynchronous mode, with tag 0 excluded. This will fail if the kernel
+  // or hardware doesn't support MTE, and we will fall back to just enabling tagged pointers in
+  // syscall arguments.
+  if (prctl(PR_SET_TAGGED_ADDR_CTRL,
+            PR_TAGGED_ADDR_ENABLE | PR_MTE_TCF_ASYNC | (1 << PR_MTE_EXCL_SHIFT), 0, 0, 0)) {
+    prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0);
+  }
+#else
   prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0);
 #endif
+#endif
 }
 
 void __libc_init_fork_handler() {
diff --git a/libc/platform/bionic/mte_kernel.h b/libc/platform/bionic/mte_kernel.h
index 04f2bb6..804311c 100644
--- a/libc/platform/bionic/mte_kernel.h
+++ b/libc/platform/bionic/mte_kernel.h
@@ -36,6 +36,16 @@
 // This interface should not be considered to be stable.
 
 #ifdef ANDROID_EXPERIMENTAL_MTE
-#define HWCAP2_MTE (1UL << 31)
-#define PROT_MTE 0x10
+
+#define HWCAP2_MTE (1 << 10)
+#define PROT_MTE 0x20
+
+#define PR_MTE_TCF_SHIFT 1
+#define PR_MTE_TCF_NONE (0UL << PR_MTE_TCF_SHIFT)
+#define PR_MTE_TCF_SYNC (1UL << PR_MTE_TCF_SHIFT)
+#define PR_MTE_TCF_ASYNC (2UL << PR_MTE_TCF_SHIFT)
+#define PR_MTE_TCF_MASK (3UL << PR_MTE_TCF_SHIFT)
+#define PR_MTE_EXCL_SHIFT 3
+#define PR_MTE_EXCL_MASK (0xffffUL << PR_MTE_EXCL_SHIFT)
+
 #endif