diff --git a/dlls/oleaut32/safearray.c b/dlls/oleaut32/safearray.c
index 85afc4aa4ac..93d51869ead 100644
--- a/dlls/oleaut32/safearray.c
+++ b/dlls/oleaut32/safearray.c
@@ -383,7 +383,7 @@ static HRESULT SAFEARRAY_CopyData(SAFEARRAY *psa, SAFEARRAY *dest)
       {
         if (*lpBstr)
         {
-          *lpDest = SysAllocStringLen(*lpBstr, SysStringLen(*lpBstr));
+          *lpDest = SysAllocStringByteLen((char*)*lpBstr, SysStringByteLen(*lpBstr));
           if (!*lpDest)
             return E_OUTOFMEMORY;
         }
@@ -887,7 +887,7 @@ HRESULT WINAPI SafeArrayPutElement(SAFEARRAY *psa, LONG *rgIndices, void *pvData
 
         if (lpBstr)
         {
-          *lpDest = SysAllocStringLen(lpBstr, SysStringLen(lpBstr));
+          *lpDest = SysAllocStringByteLen((char*)lpBstr, SysStringByteLen(lpBstr));
           if (!*lpDest)
             hRet = E_OUTOFMEMORY;
         }
@@ -968,7 +968,7 @@ HRESULT WINAPI SafeArrayGetElement(SAFEARRAY *psa, LONG *rgIndices, void *pvData
 
         if (*lpBstr)
         {
-          *lpDest = SysAllocStringLen(*lpBstr, SysStringLen(*lpBstr));
+          *lpDest = SysAllocStringByteLen((char*)*lpBstr, SysStringByteLen(*lpBstr));
           if (!*lpBstr)
             hRet = E_OUTOFMEMORY;
         }
diff --git a/dlls/oleaut32/tests/vartype.c b/dlls/oleaut32/tests/vartype.c
index 25bbee4d286..cdaf7ad3a89 100644
--- a/dlls/oleaut32/tests/vartype.c
+++ b/dlls/oleaut32/tests/vartype.c
@@ -4607,6 +4607,7 @@ static void test_SysAllocStringByteLen()
   const OLECHAR szTest[10] = { 'T','e','s','t','\0' };
   const CHAR szTestA[6] = { 'T','e','s','t','\0','?' };
   BSTR str;
+  HRESULT hres;
 
   str = SysAllocStringByteLen(szTestA, 0x80000000);
   ok (str == NULL, "Expected NULL, got %p\n", str);
@@ -4640,9 +4641,20 @@ static void test_SysAllocStringByteLen()
   {
     const CHAR szTestTruncA[4] = { 'T','e','s','\0' };
     LPINTERNAL_BSTR bstr = Get(str);
+    VARIANT vt1, vt2;
 
     ok (bstr->dwLen == 3, "Expected 3, got %ld\n", bstr->dwLen);
     ok (!lstrcmpA((LPCSTR)bstr->szString, szTestTruncA), "String different\n");
+
+    V_VT(&vt1) = VT_BSTR;
+    V_BSTR(&vt1) = str;
+    V_VT(&vt2) = VT_EMPTY;
+    hres = VariantCopy(&vt2, &vt1);
+    ok (hres == S_OK,"Failed to copy binary bstring with hres 0x%08lx\n", hres);
+    bstr = Get(V_BSTR(&vt2));
+    ok (bstr->dwLen == 3, "Expected 3, got %ld\n", bstr->dwLen);
+    ok (!lstrcmpA((LPCSTR)bstr->szString, szTestTruncA), "String different\n");
+
     SysFreeString(str);
   }
 
diff --git a/dlls/oleaut32/variant.c b/dlls/oleaut32/variant.c
index ee2ce5e72df..df477b8ab23 100644
--- a/dlls/oleaut32/variant.c
+++ b/dlls/oleaut32/variant.c
@@ -727,7 +727,7 @@ HRESULT WINAPI VariantCopy(VARIANTARG* pvargDest, VARIANTARG* pvargSrc)
       {
         if (V_BSTR(pvargSrc))
         {
-          V_BSTR(pvargDest) = SysAllocStringLen(V_BSTR(pvargSrc), SysStringLen(V_BSTR(pvargSrc)));
+          V_BSTR(pvargDest) = SysAllocStringByteLen((char*)V_BSTR(pvargSrc), SysStringByteLen(V_BSTR(pvargSrc)));
           if (!V_BSTR(pvargDest))
             hres = E_OUTOFMEMORY;
         }
@@ -852,7 +852,7 @@ HRESULT WINAPI VariantCopyInd(VARIANT* pvargDest, VARIANTARG* pvargSrc)
   else if (V_VT(pSrc) == (VT_BSTR|VT_BYREF))
   {
     /* Native doesn't check that *V_BSTRREF(pSrc) is valid */
-    V_BSTR(pvargDest) = SysAllocStringLen(*V_BSTRREF(pSrc), SysStringLen(*V_BSTRREF(pSrc)));
+    V_BSTR(pvargDest) = SysAllocStringByteLen((char*)*V_BSTRREF(pSrc), SysStringByteLen(*V_BSTRREF(pSrc)));
   }
   else if (V_VT(pSrc) == (VT_RECORD|VT_BYREF))
   {