diff --git a/include/pci.h b/include/pci.h
index 8cffff8..318bff7 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -215,7 +215,7 @@ typedef struct                       /* structure of address conversion     */
 #define PCI_INTERRUPT_PIN(i)	(((i) & 0xff00) >> 8)
 #define PCI_INTERRUPT_LINE(i)	(((i)) & 0xff)
 
-#define IS_PCI_MEM_BAR(I)	((i) & 1) == 0
+#define IS_PCI_MEM_BAR(i)	((i) & 1) == 0
 #define IS_PCI_IO_BAR(i)	((i) & 1) == 1
 #define PCI_MEMBAR_TYPE(i)	(((i) & 0x6) >> 1)
 #define PCI_IOBAR_ADR(i)	(((i) & 0xfffffffc))