diff --git a/src/coreclr/jit/codegenarm64.cpp b/src/coreclr/jit/codegenarm64.cpp
index 1f03af9313ae30..b13c11c50d6681 100644
--- a/src/coreclr/jit/codegenarm64.cpp
+++ b/src/coreclr/jit/codegenarm64.cpp
@@ -1377,10 +1377,12 @@ void CodeGen::genFuncletProlog(BasicBlock* block)
 
     if (genFuncletInfo.fiFrameType == 1)
     {
-        // With OSR we may see large values for fiSpDelta1
-        // (we really need to probe the frame, sigh)
         if (compiler->opts.IsOSR())
         {
+            // With OSR we may see large values for fiSpDelta1.
+            // We repurpose genAllocLclFram to do the necessary probing.
+            bool scratchRegIsZero = false;
+            genAllocLclFrame(-genFuncletInfo.fiSpDelta1, REG_SCRATCH, &scratchRegIsZero, maskArgRegsLiveIn);
             genStackPointerAdjustment(genFuncletInfo.fiSpDelta1, REG_SCRATCH, nullptr, /* reportUnwindData */ true);
             GetEmitter()->emitIns_R_R_R_I(INS_stp, EA_PTRSIZE, REG_FP, REG_LR, REG_SPBASE, 0);
             compiler->unwindSaveRegPair(REG_FP, REG_LR, 0);
@@ -1416,10 +1418,12 @@ void CodeGen::genFuncletProlog(BasicBlock* block)
     }
     else if (genFuncletInfo.fiFrameType == 3)
     {
-        // With OSR we may see large values for fiSpDelta1
-        // (we really need to probe the frame, sigh)
         if (compiler->opts.IsOSR())
         {
+            // With OSR we may see large values for fiSpDelta1
+            // We repurpose genAllocLclFram to do the necessary probing.
+            bool scratchRegIsZero = false;
+            genAllocLclFrame(-genFuncletInfo.fiSpDelta1, REG_SCRATCH, &scratchRegIsZero, maskArgRegsLiveIn);
             genStackPointerAdjustment(genFuncletInfo.fiSpDelta1, REG_SCRATCH, nullptr, /* reportUnwindData */ true);
             GetEmitter()->emitIns_R_R_R_I(INS_stp, EA_PTRSIZE, REG_FP, REG_LR, REG_SPBASE, 0);
             compiler->unwindSaveRegPair(REG_FP, REG_LR, 0);
@@ -1450,6 +1454,10 @@ void CodeGen::genFuncletProlog(BasicBlock* block)
 
         if (compiler->opts.IsOSR())
         {
+            // With OSR we may see large values for fiSpDelta1.
+            // We repurpose genAllocLclFram to do the necessary probing.
+            bool scratchRegIsZero = false;
+            genAllocLclFrame(-genFuncletInfo.fiSpDelta1, REG_SCRATCH, &scratchRegIsZero, maskArgRegsLiveIn);
             genStackPointerAdjustment(genFuncletInfo.fiSpDelta1, REG_SCRATCH, nullptr, /* reportUnwindData */ true);
         }
         else