diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 15e8b7c4de1383b57a01587b1634171f2a0f26a5..8e3d69e4fcb5137bde2e2aa62d3d16587d4028b1 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -64,6 +64,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		ret = poke_user(child, addr, data);
 		break;
 
+	case PTRACE_SYSEMU:
+	case PTRACE_SYSEMU_SINGLESTEP:
+		ret = -EIO;
+		break;
+
 	/* continue and stop at next (return from) syscall */
 	case PTRACE_SYSCALL:
 	/* restart after signal. */