diff --git a/src/coreclr/jit/codegenloongarch64.cpp b/src/coreclr/jit/codegenloongarch64.cpp
index 33bd2a77486c6..bdef67f16595e 100644
--- a/src/coreclr/jit/codegenloongarch64.cpp
+++ b/src/coreclr/jit/codegenloongarch64.cpp
@@ -8625,6 +8625,7 @@ void CodeGen::genFnPrologCalleeRegArgs()
                                                           (regNumber)regArg[i]);
                                 regArgNum--;
                                 regArgMaskLive &= ~genRegMask((regNumber)regArg[j]);
+                                regArg[j] = 0;
                                 if (regArgNum == 0)
                                 {
                                     break;
diff --git a/src/coreclr/jit/codegenriscv64.cpp b/src/coreclr/jit/codegenriscv64.cpp
index 4b9c4119854cd..d4bd4dcab9b6d 100644
--- a/src/coreclr/jit/codegenriscv64.cpp
+++ b/src/coreclr/jit/codegenriscv64.cpp
@@ -7960,6 +7960,7 @@ void CodeGen::genFnPrologCalleeRegArgs()
                                                         0);
                             regArgNum--;
                             regArgMaskLive &= ~genRegMask((regNumber)regArg[j]);
+                            regArg[j] = 0;
                         }
                         else if (k == i)
                         {
@@ -8037,6 +8038,7 @@ void CodeGen::genFnPrologCalleeRegArgs()
                                                             (regNumber)regArg[i], (regNumber)regArg[i]);
                                 regArgNum--;
                                 regArgMaskLive &= ~genRegMask((regNumber)regArg[j]);
+                                regArg[j] = 0;
                                 if (regArgNum == 0)
                                 {
                                     break;