diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c
index 0beb533..f4e1e5e 100644
--- a/arch/m68k/kernel/ptrace.c
+++ b/arch/m68k/kernel/ptrace.c
@@ -19,6 +19,7 @@
 #include <linux/ptrace.h>
 #include <linux/user.h>
 #include <linux/config.h>
+#include <linux/signal.h>
 
 #include <asm/uaccess.h>
 #include <asm/page.h>
@@ -251,7 +252,7 @@
 			long tmp;
 
 			ret = -EIO;
-			if ((unsigned long) data > _NSIG)
+			if (!valid_signal(data))
 				break;
 			if (request == PTRACE_SYSCALL) {
 					child->thread.work.syscall_trace = ~0;
@@ -292,7 +293,7 @@
 			long tmp;
 
 			ret = -EIO;
-			if ((unsigned long) data > _NSIG)
+			if (!valid_signal(data))
 				break;
 			child->thread.work.syscall_trace = 0;
 			tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);