diff --git a/drivers/analog/dac.c b/drivers/analog/dac.c
index 305110c6cb4..d2911e93097 100644
--- a/drivers/analog/dac.c
+++ b/drivers/analog/dac.c
@@ -541,5 +541,5 @@ int dac_register(FAR const char *path, FAR struct dac_dev_s *dev)
 
   dev->ad_ops->ao_reset(dev);
 
-  return register_driver(path, &dac_fops, 0555, dev);
+  return register_driver(path, &dac_fops, 0222, dev);
 }
diff --git a/drivers/leds/ncp5623c.c b/drivers/leds/ncp5623c.c
index c1b1ea6a750..1576bfbc3f5 100644
--- a/drivers/leds/ncp5623c.c
+++ b/drivers/leds/ncp5623c.c
@@ -295,7 +295,7 @@ int ncp5623c_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  int const ret = register_driver(devpath, &g_ncp5623c_fileops, 666, priv);
+  int const ret = register_driver(devpath, &g_ncp5623c_fileops, 0666, priv);
   if (ret != OK)
     {
       lcderr("ERROR: Failed to register driver: %d\n", ret);
diff --git a/drivers/leds/pca9635pw.c b/drivers/leds/pca9635pw.c
index 6b8d472acae..d3dfebf1bbe 100644
--- a/drivers/leds/pca9635pw.c
+++ b/drivers/leds/pca9635pw.c
@@ -363,7 +363,7 @@ int pca9635pw_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
 
   /* Register the character driver */
 
-  int const ret = register_driver(devpath, &g_pca9635pw_fileops, 666, priv);
+  int const ret = register_driver(devpath, &g_pca9635pw_fileops, 0666, priv);
   if (ret != OK)
     {
       lcderr("ERROR: Failed to register driver: %d\n", ret);