diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
index 7fd52a30e6058..830ac621dbbca 100644
--- a/arch/riscv/include/asm/pci.h
+++ b/arch/riscv/include/asm/pci.h
@@ -12,8 +12,8 @@
 
 #include <asm/io.h>
 
-#define PCIBIOS_MIN_IO		0
-#define PCIBIOS_MIN_MEM		0
+#define PCIBIOS_MIN_IO		4
+#define PCIBIOS_MIN_MEM		16
 
 /* RISC-V shim does not initialize PCI bus */
 #define pcibios_assign_all_busses() 1