diff --git a/build.sh b/build.sh
index 35423b9..bf0e59d 100644
--- a/build.sh
+++ b/build.sh
@@ -230,6 +230,7 @@ pushd "${CURL_DIR}"
 sed -i -E 's/\bmain[[:space:]]*\(([^\(\)]*)\)/wmain(\1)/g' configure
 patch -p1 -b < "${BASE_DIR}/patch/curl_getenv.diff"
 patch -p1 -b < "${BASE_DIR}/patch/curl_threads.diff"
+patch -p1 -b < "${BASE_DIR}/patch/curl_tool_cb_wrt.diff"
 patch -p1 -b < "${BASE_DIR}/patch/curl_tool_doswin.diff"
 patch -p1 -b < "${BASE_DIR}/patch/curl_tool_getparam.diff"
 patch -p1 -b < "${BASE_DIR}/patch/curl_tool_parsecfg.diff"
diff --git a/patch/curl_tool_cb_wrt.diff b/patch/curl_tool_cb_wrt.diff
new file mode 100644
index 0000000..61f6be6
--- /dev/null
+++ b/patch/curl_tool_cb_wrt.diff
@@ -0,0 +1,34 @@
+ src/tool_cb_wrt.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/tool_cb_wrt.c b/src/tool_cb_wrt.c
+index b783866..645a3cf 100644
+--- a/src/tool_cb_wrt.c
++++ b/src/tool_cb_wrt.c
+@@ -237,7 +237,7 @@ size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
+   if(isatty(fileno(outs->stream)) &&
+      GetConsoleScreenBufferInfo((HANDLE)fhnd, &console_info)) {
+     wchar_t *wc_buf;
+-    DWORD wc_len;
++    DWORD wc_len, chars_written;
+     unsigned char *rbuf = (unsigned char *)buffer;
+     DWORD rlen = (DWORD)bytes;
+ 
+@@ -292,7 +292,7 @@ size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
+               (HANDLE) fhnd,
+               prefix,
+               prefix[1] ? 2 : 1,
+-              NULL,
++              &chars_written,
+               NULL)) {
+             return CURL_WRITEFUNC_ERROR;
+           }
+@@ -351,7 +351,7 @@ size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
+           (HANDLE) fhnd,
+           wc_buf,
+           wc_len,
+-          NULL,
++          &chars_written,
+           NULL)) {
+         free(wc_buf);
+         return CURL_WRITEFUNC_ERROR;