diff --git a/arch/risc-v/src/common/riscv_cpuindex.c b/arch/risc-v/src/common/riscv_cpuindex.c
index b7d3d9d53cb..8586d1cf555 100644
--- a/arch/risc-v/src/common/riscv_cpuindex.c
+++ b/arch/risc-v/src/common/riscv_cpuindex.c
@@ -73,7 +73,7 @@ int up_this_cpu(void)
 
 int weak_function riscv_hartid_to_cpuid(int cpu)
 {
-  return cpu + CONFIG_ARCH_RV_HARTID_BASE;
+  return cpu - CONFIG_ARCH_RV_HARTID_BASE;
 }
 
 /****************************************************************************
@@ -87,5 +87,5 @@ int weak_function riscv_hartid_to_cpuid(int cpu)
 
 int weak_function riscv_cpuid_to_hartid(int cpu)
 {
-  return cpu - CONFIG_ARCH_RV_HARTID_BASE;
+  return cpu + CONFIG_ARCH_RV_HARTID_BASE;
 }