diff --git a/drivers/staging/erofs/erofs_fs.h b/drivers/staging/erofs/erofs_fs.h
index e82e833985e4..8dc2a75e478f 100644
--- a/drivers/staging/erofs/erofs_fs.h
+++ b/drivers/staging/erofs/erofs_fs.h
@@ -62,7 +62,7 @@ enum {
 	EROFS_INODE_LAYOUT_MAX
 };
 
-static bool erofs_inode_is_data_compressed(unsigned int datamode)
+static inline bool erofs_inode_is_data_compressed(unsigned int datamode)
 {
 	if (datamode == EROFS_INODE_FLAT_COMPRESSION)
 		return true;