diff --git a/.github/workflows/alpine.yml b/.github/workflows/alpine.yml
deleted file mode 100644
index 8dc0cef..0000000
--- a/.github/workflows/alpine.yml
+++ /dev/null
@@ -1,45 +0,0 @@
-name: Alpine build
-
-on:
-  push:
-    branches:
-    - main
-  pull_request:
-
-jobs:
-  test:
-    runs-on: ubuntu-latest
-    container: alpine
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Install dependencies
-        run: |
-          apk add build-base openssl-dev zlib-dev pcre2-dev \
-                  cmake git grpc-dev protobuf-dev \
-                  python3
-      - name: Checkout nginx
-        uses: actions/checkout@v4
-        with:
-          repository: nginx/nginx
-          path: nginx
-      - name: Build nginx
-        working-directory: nginx
-        run: |
-          auto/configure --with-compat --with-http_ssl_module \
-                         --with-http_v2_module --with-http_v3_module
-          make -j $(nproc)
-      - name: Build module
-        working-directory: nginx
-        run: |
-          NGX_OTEL_CMAKE_OPTS="-D NGX_OTEL_GRPC=package" \
-              auto/configure --with-compat --add-dynamic-module=..
-          make -j $(nproc) modules
-      - name: Install test dependencies
-        run: |
-          python -m venv tests-venv
-          tests-venv/bin/pip install -r tests/requirements.txt
-      - name: Run tests
-        run: |
-          tests-venv/bin/pytest tests --maxfail=10 --nginx=nginx/objs/nginx \
-                                      --module=nginx/objs/ngx_otel_module.so
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 07be30e..0f328d2 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -7,7 +7,7 @@ on:
   pull_request:
 
 jobs:
-  test:
+  build-module:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout repository
diff --git a/src/ngx_otel_module.cpp b/src/ngx_otel_module.cpp
index ecb3b00..2a38c5a 100644
--- a/src/ngx_otel_module.cpp
+++ b/src/ngx_otel_module.cpp
@@ -296,10 +296,10 @@ ngx_int_t setHeader(ngx_http_request_t* r, StrView name, StrView value)
             return NGX_ERROR;
         }
 
-        *header = {};
         header->hash = hash;
         header->key = toNgxStr(name);
         header->lowcase_key = header->key.data;
+        header->next = NULL;
     }
 
     header->value = toNgxStr(value);