diff --git a/arch/sandbox/lib/pci_io.c b/arch/sandbox/lib/pci_io.c
index 01822c6..f22e47c 100644
--- a/arch/sandbox/lib/pci_io.c
+++ b/arch/sandbox/lib/pci_io.c
@@ -91,7 +91,7 @@
 	return -ENOSYS;
 }
 
-int inl(unsigned int addr)
+int _inl(unsigned int addr)
 {
 	unsigned long value;
 	int ret;
@@ -101,7 +101,7 @@
 	return ret ? 0 : value;
 }
 
-int inw(unsigned int addr)
+int _inw(unsigned int addr)
 {
 	unsigned long value;
 	int ret;
@@ -111,7 +111,7 @@
 	return ret ? 0 : value;
 }
 
-int inb(unsigned int addr)
+int _inb(unsigned int addr)
 {
 	unsigned long value;
 	int ret;
@@ -121,17 +121,17 @@
 	return ret ? 0 : value;
 }
 
-void outl(unsigned int value, unsigned int addr)
+void _outl(unsigned int value, unsigned int addr)
 {
 	pci_io_write(addr, value, PCI_SIZE_32);
 }
 
-void outw(unsigned int value, unsigned int addr)
+void _outw(unsigned int value, unsigned int addr)
 {
 	pci_io_write(addr, value, PCI_SIZE_16);
 }
 
-void outb(unsigned int value, unsigned int addr)
+void _outb(unsigned int value, unsigned int addr)
 {
 	pci_io_write(addr, value, PCI_SIZE_8);
 }