diff --git a/lib/syscall.c b/lib/syscall.c
index 9233e23..7b09574 100644
--- a/lib/syscall.c
+++ b/lib/syscall.c
@@ -55,13 +55,13 @@ fast_syscall(int num, uint32_t a1, uint32_t a2, uint32_t a3, uint32_t a4) {
 void
 sys_cputs(const char *s, size_t len)
 {
-	fast_syscall(SYS_cputs, (uint32_t)s, len, 0, 0);
+	syscall(SYS_cputs, 0, (uint32_t)s, len, 0, 0, 0);
 }
 
 int
 sys_cgetc(void)
 {
-	return fast_syscall(SYS_cgetc, 0, 0, 0, 0);
+	return syscall(SYS_cgetc, 0, 0, 0, 0, 0, 0);
 }
 
 int