diff --git a/libc/kernel/uapi/asm-arm64/asm/hwcap.h b/libc/kernel/uapi/asm-arm64/asm/hwcap.h
index 7852454..cd03a32 100644
--- a/libc/kernel/uapi/asm-arm64/asm/hwcap.h
+++ b/libc/kernel/uapi/asm-arm64/asm/hwcap.h
@@ -94,4 +94,5 @@
 #define HWCAP2_SME_B16B16 (1UL << 41)
 #define HWCAP2_SME_F16F16 (1UL << 42)
 #define HWCAP2_MOPS (1UL << 43)
+#define HWCAP2_HBC (1UL << 44)
 #endif