diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 26e71cf..600ab2e 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -231,12 +231,12 @@
 	if (info.index >= 32)
 		return -EINVAL;
 	/* check whether the dsp was already loaded */
-	if (hw->dsp_loaded & (1 << info.index))
+	if (hw->dsp_loaded & (1u << info.index))
 		return -EBUSY;
 	err = hw->ops.dsp_load(hw, &info);
 	if (err < 0)
 		return err;
-	hw->dsp_loaded |= (1 << info.index);
+	hw->dsp_loaded |= (1u << info.index);
 	return 0;
 }