diff --git a/src/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/CallingConventions.cs b/src/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/CallingConventions.cs
index 25ee7b1daf5..f40dedb4677 100644
--- a/src/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/CallingConventions.cs
+++ b/src/System.Private.TypeLoader/src/Internal/Runtime/TypeLoader/CallingConventions.cs
@@ -935,9 +935,14 @@ public unsafe int GetNextOffset()
 #if _TARGET_ARM64_
             // NOT DESKTOP BEHAVIOR: The S and D registers overlap, and the UniversalTransitionThunk copies D registers to the transition blocks. We'll need
             // to work with the D registers here as well.
+            bool processingFloatsAsDoublesFromTransitionBlock = false;
             if (argType == CorElementType.ELEMENT_TYPE_VALUETYPE && _argTypeHandle.IsHFA() && _argTypeHandle.GetHFAType() == CorElementType.ELEMENT_TYPE_R4)
             {
-                argSize *= 2;
+                if ((argSize / sizeof(float)) + _idxFPReg <= 8)
+                {
+                    argSize *= 2;
+                    processingFloatsAsDoublesFromTransitionBlock = true;
+                }
             }
 #endif
 
@@ -1239,8 +1244,10 @@ public unsafe int GetNextOffset()
                         if (_argTypeHandle.IsHFA())
                         {
                             CorElementType type = _argTypeHandle.GetHFAType();
-                            // DESKTOP BEHAVIOR cFPRegs = (type == CorElementType.ELEMENT_TYPE_R4) ? (argSize / sizeof(float)) : (argSize / sizeof(double));
-                            cFPRegs = argSize / sizeof(double);
+                            if (processingFloatsAsDoublesFromTransitionBlock)
+                                cFPRegs = argSize / sizeof(double);
+                            else
+                                cFPRegs = (type == CorElementType.ELEMENT_TYPE_R4) ? (argSize / sizeof(float)) : (argSize / sizeof(double));
                         }
                         else
                         {