diff --git a/Makefile.target b/Makefile.target
index d1204d678f..7cfe52d779 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -433,7 +433,7 @@ ifeq ($(TARGET_BASE_ARCH), i386)
 VL_OBJS+= ide.o pckbd.o ps2.o vga.o $(SOUND_HW) dma.o $(AUDIODRV)
 VL_OBJS+= fdc.o mc146818rtc.o serial.o i8259.o i8254.o pcspk.o pc.o
 VL_OBJS+= cirrus_vga.o apic.o parallel.o acpi.o piix_pci.o
-VL_OBJS+= usb-uhci.o smbus_eeprom.o vmmouse.o vmware_vga.o
+VL_OBJS+= usb-uhci.o smbus_eeprom.o vmmouse.o vmport.o vmware_vga.o
 CPPFLAGS += -DHAS_AUDIO -DHAS_AUDIO_CHOICE
 endif
 ifeq ($(TARGET_BASE_ARCH), ppc)
diff --git a/vl.h b/vl.h
index e72df0e691..819908b22c 100644
--- a/vl.h
+++ b/vl.h
@@ -1061,6 +1061,12 @@ void lance_init(NICInfo *nd, target_phys_addr_t leaddr, void *dma_opaque,
 /* vmmouse.c */
 void *vmmouse_init(void *m);
 
+/* vmport.c */
+#ifdef TARGET_I386
+void vmport_init(CPUState *env);
+void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque);
+#endif
+
 /* pckbd.c */
 
 void i8042_init(qemu_irq kbd_irq, qemu_irq mouse_irq, uint32_t io_base);