diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index a3aeb6bd68..83c61d37b4 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -350,9 +350,6 @@ jobs:
           if [ '${{ matrix.sys }}' != 'msys' ]; then
             TFLAGS+=' ~612'  # SFTP
           fi
-          if [ '${{ matrix.sys }}' = 'clang64' ]; then
-            TFLAGS+=' ~2302 ~2303 ~2307'  # permafail with clang (and also MSVC) (but works with mingw64 and ucrt64)
-          fi
           if [ -x "$(cygpath "${SYSTEMROOT}/System32/curl.exe")" ]; then
             TFLAGS+=" -ac $(cygpath "${SYSTEMROOT}/System32/curl.exe")"
           fi
@@ -923,7 +920,7 @@ jobs:
         timeout-minutes: 10
         run: |
           export CURL_DIRSUFFIX='${{ matrix.type }}'
-          export TFLAGS='-j8 ${{ matrix.tflags }} ~2302 ~2303 ~2307'
+          export TFLAGS='-j8 ${{ matrix.tflags }}'
           TFLAGS+=' ~2310'  # flaky
           PATH="$PWD/bld/lib/${{ matrix.type }}:$PATH:/c/Program Files (x86)/stunnel/bin:/c/Program Files/OpenSSH-Win64"
           PATH="/c/msys64/usr/bin:$PATH"
diff --git a/tests/libtest/lib2302.c b/tests/libtest/lib2302.c
index 415ab9ff1f..ccf8dfb587 100644
--- a/tests/libtest/lib2302.c
+++ b/tests/libtest/lib2302.c
@@ -28,13 +28,15 @@
 
 struct ws_data {
   CURL *easy;
-  char buf[1024*1024];
+  char *buf;
   size_t blen;
   size_t nwrites;
   int has_meta;
   int meta_flags;
 };
 
+#define LIB2302_BUFSIZE (1024 * 1024)
+
 static void flush_data(struct ws_data *wd)
 {
   size_t i;
@@ -66,7 +68,7 @@ static size_t add_data(struct ws_data *wd, const char *buf, size_t blen,
     wd->meta_flags = meta ? meta->flags : 0;
   }
 
-  if(wd->blen + blen > sizeof(wd->buf)) {
+  if(wd->blen + blen > LIB2302_BUFSIZE) {
     return 0;
   }
   memcpy(wd->buf + wd->blen, buf, blen);
@@ -96,13 +98,16 @@ CURLcode test(char *URL)
   CURL *curl;
   CURLcode res = CURLE_OK;
   struct ws_data ws_data;
+  memset(&ws_data, 0, sizeof(ws_data));
 
+  ws_data.buf = (char *)calloc(LIB2302_BUFSIZE, 1);
+  if(!ws_data.buf)
+    return res;
 
   global_init(CURL_GLOBAL_ALL);
 
   curl = curl_easy_init();
   if(curl) {
-    memset(&ws_data, 0, sizeof(ws_data));
     ws_data.easy = curl;
 
     curl_easy_setopt(curl, CURLOPT_URL, URL);
@@ -118,6 +123,7 @@ CURLcode test(char *URL)
     flush_data(&ws_data);
   }
   curl_global_cleanup();
+  free(ws_data.buf);
   return res;
 }