diff --git a/source/bindbc/loader/sharedlib.d b/source/bindbc/loader/sharedlib.d
index acfde36..f0cf689 100644
--- a/source/bindbc/loader/sharedlib.d
+++ b/source/bindbc/loader/sharedlib.d
@@ -251,7 +251,16 @@ version(Windows){
 	void wstringToString(char** dst, const(wchar)* src){
 		import core.sys.windows.winnls;
 		auto srcLen = lstrlenW(src);
-		auto dstBuffLen = wchar.sizeof*srcLen + 1;
+		auto dstBuffLen = WideCharToMultiByte(
+			CP_UTF8,
+			0,
+			src,
+			srcLen,
+			null, // null dst to calculate size
+			0,
+			null,
+			null,
+		);
 		*dst = cast(char*)malloc(dstBuffLen);
 		WideCharToMultiByte(
 			CP_UTF8,