--- a/include/random/sys/random.h	(index)
+++ b/include/random/sys/random.h	(working tree)
@@ -4,9 +4,9 @@
 extern "C" {
 #endif
 
-#define __NEED_size_t
-#define __NEED_ssize_t
-#include <bits/alltypes.h>
+#include <sys/types.h>
+
+#if !defined(SYS_getrandom)
+#if defined(__x86_64__)
+    #define SYS_getrandom 318
+#elif defined(__i386__)
+    #define SYS_getrandom 355
+#elif defined(__aarch64__)
+    #define SYS_getrandom 278
+#elif defined(__arm__)
+    #define SYS_getrandom 384
+#elif defined(__powerpc__)
+    #define SYS_getrandom 359
+#else
+#error Unsupported platform
+#endif
+#endif
 
 #define GRND_NONBLOCK	0x0001
 #define GRND_RANDOM	0x0002
--- a/getrandom.c	(index)
+++ b/getrandom.c	(working tree)
@@ -3,5 +3,5 @@
 
 ssize_t getrandom(void *buf, size_t buflen, unsigned flags)
 {
-	return syscall_cp(SYS_getrandom, buf, buflen, flags);
+	return syscall(SYS_getrandom, buf, buflen, flags);
 }