diff --git a/include/nuttx/pci/pci_regs.h b/include/nuttx/pci/pci_regs.h
index 5eb3331e86..2c362cf78d 100644
--- a/include/nuttx/pci/pci_regs.h
+++ b/include/nuttx/pci/pci_regs.h
@@ -26,6 +26,7 @@
  */
 
 #define PCI_STD_HEADER_SIZEOF             64
+#define PCI_STD_NUM_BARS                  6     /* Number of standard BARs */
 #define PCI_VENDOR_ID                     0x00  /* 16 bits */
 #define PCI_DEVICE_ID                     0x02  /* 16 bits */
 #define PCI_COMMAND                       0x04  /* 16 bits */