diff --git a/prog/detect/sensors-detect b/prog/detect/sensors-detect
index 355664f8..8e499d74 100755
--- a/prog/detect/sensors-detect
+++ b/prog/detect/sensors-detect
@@ -3151,19 +3151,18 @@ sub lm92_detect
 #   0xAC: Configuration
 # Detection is weak. We check if bit 4 (NVB) is clear, because it is
 # unlikely to be set (would mean that EEPROM is currently being accessed).
-# Temperature checkings will hopefully prevent LM75 chips from being
-# detected as a DS1621.
+# Temperature checkings will hopefully prevent LM75 or other chips from
+# being detected as a DS1621.
 sub ds1621_detect
 {
   my $i;
   my ($file,$addr) = @_;
   my $temp = i2c_smbus_read_word_data($file,0xAA);
-  return if ($temp & 0x7F00);
-  $temp = i2c_smbus_read_word_data($file,0xA1);
-  return if ($temp & 0x7F00);
-  $temp = i2c_smbus_read_word_data($file,0xA2);
-  return if ($temp & 0x7F00);
+  my $high = i2c_smbus_read_word_data($file,0xA1);
+  my $low = i2c_smbus_read_word_data($file,0xA2);
+  return if ($temp | $high | $low) & 0x7F00;
   my $conf = i2c_smbus_read_byte_data($file,0xAC);
+  return if ($temp == 0 && $high == 0 && $low == 0 && $conf == 0);
   return 3 if ($conf & 0x10) == 0x00;
   return;
 }