diff --git a/headers/private/kernel/syscall_restart.h b/headers/private/kernel/syscall_restart.h
index bcccb2f1d6..fd9d93879b 100644
--- a/headers/private/kernel/syscall_restart.h
+++ b/headers/private/kernel/syscall_restart.h
@@ -50,7 +50,7 @@ syscall_restart_handle_timeout_pre(uint32& flags, bigtime_t& timeout)
 		timeout = *(bigtime_t*)thread->syscall_restart.parameters;
 		if (timeout > 0 && (flags & B_RELATIVE_TIMEOUT) != 0)
 			flags = (flags & ~B_RELATIVE_TIMEOUT) | B_ABSOLUTE_TIMEOUT;
-	} else if ((flags & B_RELATIVE_TIMEOUT)) {
+	} else if ((flags & B_RELATIVE_TIMEOUT) != 0) {
 		if (timeout > 0 && timeout < B_INFINITE_TIMEOUT) {
 			timeout += system_time();
 			// deal with overflow