diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 739974460c32..e03995851e60 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -587,7 +587,7 @@ out_unlock:
 	return count;
 }
 
-const struct file_operations filter_fops = {
+static const struct file_operations filter_fops = {
 	.read  = filter_read,
 	.write = filter_write,
 };