diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index db1f29673c0688a1de7f88fd00b7e1e6ad42211e..575fbf81fad02dcd8e946cecfa9c5d5c35e11810 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -21,7 +21,7 @@ extern struct pci_dev *isa_bridge_pcidev;
 /*
  * has legacy ISA devices ?
  */
-#define arch_has_dev_port()	(isa_bridge_pcidev != NULL)
+#define arch_has_dev_port()	(isa_bridge_pcidev != NULL || isa_io_special)
 #endif
 
 #include <linux/device.h>