diff --git a/util/cpuinfo-riscv.c b/util/cpuinfo-riscv.c
index 497ce12..8cacc67 100644
--- a/util/cpuinfo-riscv.c
+++ b/util/cpuinfo-riscv.c
@@ -9,6 +9,7 @@
 #ifdef CONFIG_ASM_HWPROBE_H
 #include <asm/hwprobe.h>
 #include <sys/syscall.h>
+#include <asm/unistd.h>
 #endif
 
 unsigned cpuinfo;