diff --git a/CHANGES b/CHANGES
index 1fe5d71..92083eb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -41,6 +41,7 @@ SVN HEAD
                 Encode "degrees" to HTML degree symbol
                 Generate XHTML 1.1 compliant markup
                 Add a manual page
+                Correctly check for out-of-bounds vendor ID
   decode-vaio: Add a manual page
   eeprog: Add a manual page
   eeprom: Add a manual page
diff --git a/eeprom/decode-dimms b/eeprom/decode-dimms
index ca2e29f..2eb1975 100755
--- a/eeprom/decode-dimms
+++ b/eeprom/decode-dimms
@@ -345,7 +345,7 @@ sub manufacturer_ddr3($$)
 	my $manufacturer;
 
 	return "Invalid" if parity($code) != 1;
-	return "Unknown" if ($code & 0x7F) - 1 > $vendors[$count & 0x7F];
+	return "Unknown" if ($code & 0x7F) - 1 >= @{$vendors[$count & 0x7F]};
 	$manufacturer = $vendors[$count & 0x7F][($code & 0x7F) - 1];
 	$manufacturer =~ s/ \(former .*\)$// if $opt_side_by_side;
 	$manufacturer .= "? (Invalid parity)" if parity($count) != 1;