diff --git a/include/sys/syscall.h b/include/sys/syscall.h
index 0890ff66e38..b041abda913 100644
--- a/include/sys/syscall.h
+++ b/include/sys/syscall.h
@@ -401,7 +401,7 @@
 #  define SYS_pthread_mutex_unlock     (__SYS_pthread+21)
 #  define SYS_pthread_once             (__SYS_pthread+22)
 #  define SYS_pthread_setcancelstate   (__SYS_pthread+23)
-#  define SYS_Pthread_setcanceltype    (__SYS_pthread+24)
+#  define SYS_pthread_setcanceltype    (__SYS_pthread+24)
 #  define SYS_pthread_setschedparam    (__SYS_pthread+25)
 #  define SYS_pthread_setschedprio     (__SYS_pthread+26)
 #  define SYS_pthread_setspecific      (__SYS_pthread+27)