diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index f23c8fda6503453668aed0f35c14bce99d0a7004..c49865b30719d2e8113313591834f34d4d5fa063 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -526,7 +526,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 			 * Set some valid stack frames to give to the child.
 			 */
 			childstack = (struct sparc_stackf __user *)
-				(sp & ~0x15UL);
+				(sp & ~0xfUL);
 			parentstack = (struct sparc_stackf __user *)
 				regs->u_regs[UREG_FP];