diff --git a/sys/include/libc.h b/sys/include/libc.h
index de36b13..079c7eb 100644
--- a/sys/include/libc.h
+++ b/sys/include/libc.h
@@ -636,9 +636,6 @@ extern int		jehanne_dirmodefmt(Fmt*);
 # define NPRIVATES	16
 #endif
 
-/* can be overwritten to do anything before calling main */
-extern void __libc_init(int argc, char *argv[]) __attribute__((weak, noreturn));
-
 /* compiler directives on plan 9 */
 #define SET(x)  ((x)=0)
 #define USED(x) if(x){}else{}
diff --git a/sys/src/lib/c/amd64/initlib.c b/sys/src/lib/c/amd64/initlib.c
index d8ce9d1..8e8d840 100644
--- a/sys/src/lib/c/amd64/initlib.c
+++ b/sys/src/lib/c/amd64/initlib.c
@@ -23,6 +23,9 @@ extern int	_nprivates;
 
 static void call_main(int argc, char *argv[]) __attribute__((noreturn));
 
+/* can be overwritten to do anything before calling main */
+extern void __libc_init(int argc, char *argv[]) __attribute__((weak, noreturn));
+
 void
 __jehanne_libc_init(int argc, char *argv[])
 {