diff --git a/src/xz/file_io.c b/src/xz/file_io.c
index bc4f933d..37710428 100644
--- a/src/xz/file_io.c
+++ b/src/xz/file_io.c
@@ -233,13 +233,11 @@ io_sandbox_enter(int src_fd)
 
 #ifdef HAVE_CAPSICUM
 capsicum_error:
-	// Even though it is undocumented, if a kernel is configured without
-	// capability mode support or used in an emulator that does not
-	// implement the capability system calls, then the capsicum system
-	// calls will fail and set errno to ENOSYS.
+	// If a kernel is configured without capability mode support or
+	// used in an emulator that does not implement the capability
+	// system calls, then the capsicum system calls will fail and set
+	// errno to ENOSYS.
 	if (errno == ENOSYS) {
-		message_warning(_("%s: Cannot enable the sandbox"),
-				strerror(errno));
 		sandbox_allowed = false;
 		return;
 	}