diff --git a/libc/platform/bionic/macros.h b/libc/platform/bionic/macros.h
index 076cff1..9e13e0d 100644
--- a/libc/platform/bionic/macros.h
+++ b/libc/platform/bionic/macros.h
@@ -55,6 +55,8 @@
 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined x30")
 #elif defined(__i386__)
 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%eip")
+#elif defined(__riscv)
+#define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined ra")
 #elif defined(__x86_64__)
 #define BIONIC_STOP_UNWIND asm volatile(".cfi_undefined \%rip")
 #endif