diff --git a/src/coreclr/classlibnative/bcltype/varargsnative.cpp b/src/coreclr/classlibnative/bcltype/varargsnative.cpp
index a53c0b09ba55a..a5f206aeef5de 100644
--- a/src/coreclr/classlibnative/bcltype/varargsnative.cpp
+++ b/src/coreclr/classlibnative/bcltype/varargsnative.cpp
@@ -116,7 +116,7 @@ static void InitCommon(VARARGS *data, VASigCookie** cookie)
     // Always skip over the varargs_cookie.
     const bool isValueType = false;
     const bool isFloatHfa = false;
-    data->ArgPtr += StackElemSize(sizeof(LPVOID), isValueType, isFloatHfa);
+    data->ArgPtr += StackElemSize(TARGET_POINTER_SIZE, isValueType, isFloatHfa);
 #endif
 }
 
diff --git a/src/coreclr/vm/amd64/cgencpu.h b/src/coreclr/vm/amd64/cgencpu.h
index 4f40b0cf0a635..7312ad0a019fe 100644
--- a/src/coreclr/vm/amd64/cgencpu.h
+++ b/src/coreclr/vm/amd64/cgencpu.h
@@ -149,7 +149,7 @@ void     R8ToFPSpill(void* pSpillSlot, SIZE_T  srcDoubleAsSIZE_T)
 
 inline unsigned StackElemSize(unsigned parmSize, bool isValueType = false /* unused */, bool isFloatHfa = false /* unused */)
 {
-    const unsigned stackSlotSize = sizeof(void*);
+    const unsigned stackSlotSize = 8;
     return ALIGN_UP(parmSize, stackSlotSize);
 }
 
diff --git a/src/coreclr/vm/arm/cgencpu.h b/src/coreclr/vm/arm/cgencpu.h
index 68c70cda7b817..c68e763e8945d 100644
--- a/src/coreclr/vm/arm/cgencpu.h
+++ b/src/coreclr/vm/arm/cgencpu.h
@@ -103,7 +103,7 @@ EXTERN_C void setFPReturn(int fpSize, INT64 retVal);
 
 inline unsigned StackElemSize(unsigned parmSize, bool isValueType = false /* unused */, bool isFloatHfa = false /* unused */)
 {
-    const unsigned stackSlotSize = sizeof(void*);
+    const unsigned stackSlotSize = 4;
     return ALIGN_UP(parmSize, stackSlotSize);
 }
 
diff --git a/src/coreclr/vm/arm64/cgencpu.h b/src/coreclr/vm/arm64/cgencpu.h
index 42bf8038e716c..c87dbb11601f8 100644
--- a/src/coreclr/vm/arm64/cgencpu.h
+++ b/src/coreclr/vm/arm64/cgencpu.h
@@ -101,7 +101,7 @@ inline unsigned StackElemSize(unsigned parmSize, bool isValueType, bool isFloatH
     }
 #endif
 
-    const unsigned stackSlotSize = sizeof(void*);
+    const unsigned stackSlotSize = 8;
     return ALIGN_UP(parmSize, stackSlotSize);
 }
 
diff --git a/src/coreclr/vm/i386/cgencpu.h b/src/coreclr/vm/i386/cgencpu.h
index 3c7d700e8d953..04de3f584ae9e 100644
--- a/src/coreclr/vm/i386/cgencpu.h
+++ b/src/coreclr/vm/i386/cgencpu.h
@@ -104,7 +104,7 @@ EXTERN_C void SinglecastDelegateInvokeStub();
 
 inline unsigned StackElemSize(unsigned parmSize, bool isValueType = false /* unused */, bool isFloatHfa = false /* unused */)
 {
-    const unsigned stackSlotSize = sizeof(void*);
+    const unsigned stackSlotSize = 4;
     return ALIGN_UP(parmSize, stackSlotSize);
 }