diff --git a/ulib/_premain.c b/ulib/_premain.c
index 9e16503..53380dd 100644
--- a/ulib/_premain.c
+++ b/ulib/_premain.c
@@ -9,8 +9,8 @@
 #include <umalloc/umalloc.h>
 
 extern void main(void);
-extern uint8_t _bss_start[];
-extern uint8_t _bss_end[];
+extern volatile uint8_t _bss_start[];
+extern volatile uint8_t _bss_end[];
 
 void clearbss(void) {
   uint8_t *p = _bss_start;
@@ -20,7 +20,7 @@ void clearbss(void) {
 }
 
 #define MAX_ARGS 25
-static char *_args[MAX_ARGS];
+static volatile char *_args[MAX_ARGS];
 
 size_t _argslen;
 
@@ -40,7 +40,7 @@ void _premain(void) {
     _args[i] = umalloc(PROC_ARG_MAX);
   }
 
-  proc_argv(-1, &_argslen, _args, MAX_ARGS);
+  proc_argv(-1, &_argslen, (char **)_args, MAX_ARGS);
 
   main();
   proc_kill(proc_getpid());