diff --git a/include/asm-parisc/io.h b/include/asm-parisc/io.h
index c0fed91da3a2..4cc9bcec0564 100644
--- a/include/asm-parisc/io.h
+++ b/include/asm-parisc/io.h
@@ -15,6 +15,16 @@ extern unsigned long parisc_vmerge_max_size;
 #define virt_to_bus virt_to_phys
 #define bus_to_virt phys_to_virt
 
+static inline unsigned long isa_bus_to_virt(unsigned long addr) {
+	BUG();
+	return 0;
+}
+
+static inline unsigned long isa_virt_to_bus(void *addr) {
+	BUG();
+	return 0;
+}
+
 /*
  * Memory mapped I/O
  *