diff --git a/clang/test/Sema/aarch64-sme2p1-diagnostics.c b/clang/test/Sema/aarch64-sme2p1-diagnostics.c
new file mode 100644
index 0000000000000..a0adb04038581
--- /dev/null
+++ b/clang/test/Sema/aarch64-sme2p1-diagnostics.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu  -target-feature +sme2p1 -fsyntax-only -verify %s
+
+// REQUIRES: aarch64-registered-target
+#include "arm_sme.h"
+
+svuint8x2_t  test_sme2p1(svuint8x2_t  x) {
+  // expected-no-diagnostics
+  return x;
+}
+
diff --git a/llvm/include/llvm/TargetParser/AArch64TargetParser.h b/llvm/include/llvm/TargetParser/AArch64TargetParser.h
index ed9944bcef23d..7376ac98a2b09 100644
--- a/llvm/include/llvm/TargetParser/AArch64TargetParser.h
+++ b/llvm/include/llvm/TargetParser/AArch64TargetParser.h
@@ -273,7 +273,7 @@ inline constexpr ExtensionInfo Extensions[] = {
     {"sme-i16i64", AArch64::AEK_SMEI16I64, "+sme-i16i64", "-sme-i16i64", FEAT_SME_I64, "+sme,+sme-i16i64,+bf16", 570},
     {"sme", AArch64::AEK_SME, "+sme", "-sme", FEAT_SME, "+sme,+bf16", 430},
     {"sme2", AArch64::AEK_SME2, "+sme2", "-sme2", FEAT_SME2, "+sme2,+sme,+bf16", 580},
-    {"sme2p1", AArch64::AEK_SME2p1, "+sme2p1", "-sme2p1", FEAT_INIT, "", 0},
+    {"sme2p1", AArch64::AEK_SME2p1, "+sme2p1", "-sme2p1", FEAT_INIT, "+sme2p1,+sme2,+sme,+bf16", 0},
     {"ssbs", AArch64::AEK_SSBS, "+ssbs", "-ssbs", FEAT_SSBS, "", 490},
     {"ssbs2", AArch64::AEK_NONE, {}, {}, FEAT_SSBS2, "+ssbs", 500},
     {"sve-bf16", AArch64::AEK_NONE, {}, {}, FEAT_SVE_BF16, "+sve,+bf16,+fullfp16,+fp-armv8,+neon", 320},