diff --git a/libc-test/build.rs b/libc-test/build.rs
index 77be86299ab18..0d52a86053b80 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3448,6 +3448,7 @@ fn test_linux(target: &str) {
     // Include linux headers at the end:
     headers! {
         cfg:
+        [riscv64]: "asm/hwcap.h",
         "asm/mman.h",
         [gnu]: "linux/aio_abi.h",
         "linux/can.h",
diff --git a/libc-test/semver/linux-riscv64gc.txt b/libc-test/semver/linux-riscv64gc.txt
index cc4d97fe6fa51..4f270540cc3a2 100644
--- a/libc-test/semver/linux-riscv64gc.txt
+++ b/libc-test/semver/linux-riscv64gc.txt
@@ -69,3 +69,10 @@ TIOCSRS485
 flock64
 fsblkcnt64_t
 fsfilcnt64_t
+COMPAT_HWCAP_ISA_I
+COMPAT_HWCAP_ISA_M
+COMPAT_HWCAP_ISA_A
+COMPAT_HWCAP_ISA_F
+COMPAT_HWCAP_ISA_D
+COMPAT_HWCAP_ISA_C
+COMPAT_HWCAP_ISA_V
diff --git a/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs b/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
index 8e06a135baa42..64f5cf10f8583 100644
--- a/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
@@ -540,6 +540,14 @@ pub const REG_A0: usize = 10;
 pub const REG_S2: usize = 18;
 pub const REG_NARGS: usize = 8;
 
+pub const COMPAT_HWCAP_ISA_I: ::c_ulong = 1 << (b'I' - b'A');
+pub const COMPAT_HWCAP_ISA_M: ::c_ulong = 1 << (b'M' - b'A');
+pub const COMPAT_HWCAP_ISA_A: ::c_ulong = 1 << (b'A' - b'A');
+pub const COMPAT_HWCAP_ISA_F: ::c_ulong = 1 << (b'F' - b'A');
+pub const COMPAT_HWCAP_ISA_D: ::c_ulong = 1 << (b'D' - b'A');
+pub const COMPAT_HWCAP_ISA_C: ::c_ulong = 1 << (b'C' - b'A');
+pub const COMPAT_HWCAP_ISA_V: ::c_ulong = 1 << (b'V' - b'A');
+
 pub const SYS_read: ::c_long = 63;
 pub const SYS_write: ::c_long = 64;
 pub const SYS_close: ::c_long = 57;