diff --git a/sysdeps/m68k/__longjmp.c b/sysdeps/m68k/__longjmp.c
index 787281708c..10e1705f9c 100644
--- a/sysdeps/m68k/__longjmp.c
+++ b/sysdeps/m68k/__longjmp.c
@@ -23,7 +23,7 @@ Cambridge, MA 02139, USA.  */
    setjmp call there to return VAL, or 1 if VAL is 0.  */
 __NORETURN
 void
-__longjmp (__jmp_buf env, int val)
+__longjmp (const __jmp_buf env, int val)
 {
   /* This restores the FP and SP that setjmp's caller had,
      and puts the return address into A0 and VAL into D0. */