diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 396d9ccf77..144285ae18 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -56,6 +56,8 @@ jobs:
         env:
           phpts: ts
           debug: true
+      - name: Install system dependencies
+        run: sudo apt-get update && sudo apt-get install --reinstall -y libbrotli-dev
       - name: Install e-dant/watcher
         uses: ./.github/actions/watcher
       - name: Set CGO flags
diff --git a/frankenphp.c b/frankenphp.c
index 8037886f67..b482f4590e 100644
--- a/frankenphp.c
+++ b/frankenphp.c
@@ -89,7 +89,12 @@ __thread HashTable *sandboxed_env = NULL;
 
 #ifndef PHP_WIN32
 static bool is_forked_child = false;
-static void frankenphp_fork_child(void) { is_forked_child = true; }
+static void frankenphp_fork_child(void) {
+  is_forked_child = true;
+#ifdef __linux__
+  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+#endif
+}
 #endif
 
 void frankenphp_update_local_thread_context(bool is_worker) {
@@ -762,6 +767,12 @@ static int frankenphp_startup(sapi_module_struct *sapi_module) {
 static int frankenphp_deactivate(void) { return SUCCESS; }
 
 static size_t frankenphp_ub_write(const char *str, size_t str_length) {
+#ifndef PHP_WIN32
+  if (UNEXPECTED(is_forked_child)) {
+    return 0;
+  }
+#endif
+
   struct go_ub_write_return result =
       go_ub_write(thread_index, (char *)str, str_length);
 
@@ -773,6 +784,12 @@ static size_t frankenphp_ub_write(const char *str, size_t str_length) {
 }
 
 static int frankenphp_send_headers(sapi_headers_struct *sapi_headers) {
+#ifndef PHP_WIN32
+  if (UNEXPECTED(is_forked_child)) {
+    return SAPI_HEADER_SEND_FAILED;
+  }
+#endif
+
   if (SG(request_info).no_headers == 1) {
     return SAPI_HEADER_SENT_SUCCESSFULLY;
   }
@@ -798,6 +815,12 @@ static int frankenphp_send_headers(sapi_headers_struct *sapi_headers) {
 }
 
 static void frankenphp_sapi_flush(void *server_context) {
+#ifndef PHP_WIN32
+  if (UNEXPECTED(is_forked_child)) {
+    return;
+  }
+#endif
+
   sapi_send_headers();
   if (go_sapi_flush(thread_index)) {
     php_handle_aborted_connection();