diff --git a/CHANGES b/CHANGES
index c41f4895..7a27669b 100644
--- a/CHANGES
+++ b/CHANGES
@@ -16,6 +16,7 @@ SVN HEAD
                   Make LM73 detection less problematic
                   Add detection of National Semiconductor LM96163
                   Add detection of GMT G781
+                  Properly handle Super-I/O chips without logical device
 
 3.3.1 (2011-07-21)
   isadump: Add support for word (16-bit) and long (32-bit) reads
diff --git a/prog/detect/sensors-detect b/prog/detect/sensors-detect
index 95c55b49..d2ab3753 100755
--- a/prog/detect/sensors-detect
+++ b/prog/detect/sensors-detect
@@ -3766,6 +3766,10 @@ sub probe_superio
 		print "\n    (hardware monitoring capabilities accessible via SMBus only)\n";
 		return FEAT_SMBUS;
 	}
+	if (!exists $chip->{logdev}) {
+		print "\n    (no support yet)\n";
+		return 0;
+	}
 
 	# Switch to the sensor logical device
 	outb($addrreg, $superio{logdevreg});