diff --git a/shared/gasync/src/input/windows/rawinput.c b/shared/gasync/src/input/windows/rawinput.c
index 6a2763a1..44d7a8a5 100644
--- a/shared/gasync/src/input/windows/rawinput.c
+++ b/shared/gasync/src/input/windows/rawinput.c
@@ -407,11 +407,11 @@ static SP_DEVINFO_DATA * get_devinfo_data(const char * instanceId) {
 static char * utf16le_to_utf8(const unsigned char * inbuf, size_t insize)
 {
   char * outbuf = NULL;
-  int outsize = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR ) inbuf, insize, NULL, 0, NULL, NULL);
+  int outsize = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR ) inbuf, -1, NULL, 0, NULL, NULL);
   if (outsize != 0) {
       outbuf = (char*) malloc(outsize);
       if (outbuf != NULL) {
-         int res = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR ) inbuf, insize, outbuf, outsize, NULL, NULL);
+         int res = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR ) inbuf, -1, outbuf, outsize, NULL, NULL);
          if (res == 0) {
              PRINT_ERROR_GETLASTERROR("WideCharToMultiByte")
              free(outbuf);