diff --git a/dlls/oleaut32/tests/vartest.c b/dlls/oleaut32/tests/vartest.c
index 770ea5fed1f..1ac09cd4ae3 100644
--- a/dlls/oleaut32/tests/vartest.c
+++ b/dlls/oleaut32/tests/vartest.c
@@ -2007,6 +2007,8 @@ static void test_VarNot(void)
 {
     static const WCHAR szNum0[] = {'0','\0' };
     static const WCHAR szNum1[] = {'1','\0' };
+    static const WCHAR szFalse[] = { '#','F','A','L','S','E','#','\0' };
+    static const WCHAR szTrue[] = { '#','T','R','U','E','#','\0' };
     HRESULT hres;
     VARIANT v, exp, vDst;
     DECIMAL *pdec = &V_DECIMAL(&v);
@@ -2102,6 +2104,8 @@ static void test_VarNot(void)
     ok(V_VT(&v) == VT_BSTR && V_BSTR(&v) == szNum0, "VarNot(0): changed input\n");
     VARNOT(BSTR,(BSTR)szNum1,I4,-2);
     ok(V_VT(&v) == VT_BSTR && V_BSTR(&v) == szNum1, "VarNot(1): changed input\n");
+    VARNOT(BSTR, (BSTR)szTrue, BOOL, VARIANT_FALSE);
+    VARNOT(BSTR, (BSTR)szFalse, BOOL, VARIANT_TRUE);
 
     V_VT(&v) = VT_DECIMAL;
     S(U(*pdec)).sign = DECIMAL_NEG;
diff --git a/dlls/oleaut32/variant.c b/dlls/oleaut32/variant.c
index 20df548d40c..2045eab4b1c 100644
--- a/dlls/oleaut32/variant.c
+++ b/dlls/oleaut32/variant.c
@@ -5026,6 +5026,19 @@ HRESULT WINAPI VarNot(LPVARIANT pVarIn, LPVARIANT pVarOut)
         pVarIn = &temp;
     }
 
+    if (V_VT(pVarIn) == VT_BSTR)
+    {
+        V_VT(&varIn) = VT_R8;
+        hRet = VarR8FromStr( V_BSTR(pVarIn), LOCALE_USER_DEFAULT, 0, &V_R8(&varIn) );
+        if (FAILED(hRet))
+        {
+            V_VT(&varIn) = VT_BOOL;
+            hRet = VarBoolFromStr( V_BSTR(pVarIn), LOCALE_USER_DEFAULT, VAR_LOCALBOOL, &V_BOOL(&varIn) );
+        }
+        if (FAILED(hRet)) goto VarNot_Exit;
+        pVarIn = &varIn;
+    }
+
     V_VT(pVarOut) = V_VT(pVarIn);
 
     switch (V_VT(pVarIn))
@@ -5066,12 +5079,6 @@ HRESULT WINAPI VarNot(LPVARIANT pVarIn, LPVARIANT pVarOut)
         V_I4(pVarOut) = ~V_I4(pVarOut);
         V_VT(pVarOut) = VT_I4;
         break;
-    case VT_BSTR:
-        hRet = VarR8FromStr(V_BSTR(pVarIn), LOCALE_USER_DEFAULT, 0, &V_R8(&varIn));
-        if (FAILED(hRet))
-            break;
-        pVarIn = &varIn;
-        /* Fall through ... */
     case VT_DATE:
     case VT_R8:
         hRet = VarI4FromR8(V_R8(pVarIn), &V_I4(pVarOut));