diff --git a/lib/vtls/rustls.c b/lib/vtls/rustls.c
index 9890f65538..8d0285a74b 100644
--- a/lib/vtls/rustls.c
+++ b/lib/vtls/rustls.c
@@ -160,7 +160,11 @@ static ssize_t tls_recv_more(struct Curl_cfilter *cf,
   io_ctx.data = data;
   io_error = rustls_connection_read_tls(backend->conn, read_cb, &io_ctx,
                                         &tls_bytes_read);
-  if(io_error == EAGAIN || io_error == EWOULDBLOCK) {
+  if(io_error == EWOULDBLOCK
+#if EAGAIN != EWOULDBLOCK
+     || io_error == EAGAIN
+#endif
+    ) {
     *err = CURLE_AGAIN;
     return -1;
   }
@@ -270,7 +274,11 @@ static CURLcode cr_flush_out(struct Curl_cfilter *cf, struct Curl_easy *data,
   while(rustls_connection_wants_write(rconn)) {
     io_error = rustls_connection_write_tls(rconn, write_cb, &io_ctx,
                                            &tlswritten);
-    if(io_error == EAGAIN || io_error == EWOULDBLOCK) {
+    if(io_error == EWOULDBLOCK
+#if EAGAIN != EWOULDBLOCK
+       || io_error == EAGAIN
+#endif
+      ) {
       CURL_TRC_CF(data, cf, "cf_send: EAGAIN after %zu bytes",
                   tlswritten_total);
       return CURLE_AGAIN;