diff --git a/repos/ports/src/virtualbox/ioport.cc b/repos/ports/src/virtualbox/ioport.cc
index 34657f81cc..73556ddb8d 100644
--- a/repos/ports/src/virtualbox/ioport.cc
+++ b/repos/ports/src/virtualbox/ioport.cc
@@ -133,9 +133,15 @@ class Guest_ioports
 			return 0;
 		}
 
+		/*
+		 * The whitelist is used to suppress log messages, which the VM tries
+		 * to access I/O ports with no device model associated. TinyCore Linux
+		 * seems to probe a lot of I/O ports, e.g. the LPT3 ports.
+		 */
 		bool _white_listed(RTIOPORT port)
 		{
 			/* LPT1 */ if (port >= 0x0378 && port <= 0x037f) return true;
+			/* LPT3 */ if (port >= 0x0278 && port <= 0x027f) return true;
 			/* ECP  */ if (port >= 0x0778 && port <= 0x077a) return true;
 			/* IDE1 */ if (port >= 0x0170 && port <= 0x017f) return true;
 			return false;