diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 012c314..56b9554 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,46 +1,50 @@
-name: build
-
-on: [push, pull_request]
-
-jobs:
-  unix:
-    strategy:
-      matrix:
-        os: [ubuntu, macos]
-        compiler: [g++, clang++]
-        defines: [standard, PUGIXML_WCHAR_MODE, PUGIXML_COMPACT, PUGIXML_NO_EXCEPTIONS]
-        exclude:
-          - os: macos
-            compiler: g++
-    runs-on: ${{matrix.os}}-latest
-    steps:
-    - uses: actions/checkout@v1
-    - name: make test
-      run: |
-        export CXX=${{matrix.compiler}}
-        make test cxxstd=c++11 defines=${{matrix.defines}} config=release -j2
-        make test cxxstd=c++98 defines=${{matrix.defines}} config=debug -j2
-        make test defines=${{matrix.defines}} config=sanitize -j2
-    - name: make coverage
-      if: ${{matrix.os == 'ubuntu' && matrix.compiler == 'clang++'}}
-      run: |
-        make test defines=${{matrix.defines}} config=coverage -j2
-        bash <(curl -s https://codecov.io/bash) -f pugixml.cpp.gcov -X search -t ${{secrets.CODECOV_TOKEN}} -B ${{github.ref}}
-
-  windows:
-    runs-on: windows-latest
-    strategy:
-      matrix:
-        arch: [Win32, x64]
-        defines: [standard, PUGIXML_WCHAR_MODE, PUGIXML_COMPACT, PUGIXML_NO_EXCEPTIONS]
-    steps:
-    - uses: actions/checkout@v1
-    - name: cmake configure
-      run: cmake . -DPUGIXML_BUILD_TESTS=ON -DPUGIXML_BUILD_DEFINES=${{matrix.defines}} -A ${{matrix.arch}}
-    - name: cmake test
-      shell: bash # necessary for fail-fast
-      run: |
-        cmake --build . -- -property:Configuration=Debug -verbosity:minimal
-        Debug/pugixml-check.exe
-        cmake --build . -- -property:Configuration=Release -verbosity:minimal
-        Release/pugixml-check.exe
+name: build
+
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+
+jobs:
+  unix:
+    strategy:
+      matrix:
+        os: [ubuntu, macos]
+        compiler: [g++, clang++]
+        defines: [standard, PUGIXML_WCHAR_MODE, PUGIXML_COMPACT, PUGIXML_NO_EXCEPTIONS]
+        exclude:
+          - os: macos
+            compiler: g++
+    runs-on: ${{matrix.os}}-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: make test
+      run: |
+        export CXX=${{matrix.compiler}}
+        make test cxxstd=c++11 defines=${{matrix.defines}} config=release -j2
+        make test cxxstd=c++98 defines=${{matrix.defines}} config=debug -j2
+        make test defines=${{matrix.defines}} config=sanitize -j2
+    - name: make coverage
+      if: ${{matrix.os == 'ubuntu' && matrix.compiler == 'clang++'}}
+      run: |
+        make test defines=${{matrix.defines}} config=coverage -j2
+        bash <(curl -s https://codecov.io/bash) -f pugixml.cpp.gcov -X search -t ${{secrets.CODECOV_TOKEN}} -B ${{github.ref}}
+
+  windows:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        arch: [Win32, x64]
+        defines: [standard, PUGIXML_WCHAR_MODE, PUGIXML_COMPACT, PUGIXML_NO_EXCEPTIONS]
+    steps:
+    - uses: actions/checkout@v1
+    - name: cmake configure
+      run: cmake . -DPUGIXML_BUILD_TESTS=ON -DPUGIXML_BUILD_DEFINES=${{matrix.defines}} -A ${{matrix.arch}}
+    - name: cmake test
+      shell: bash # necessary for fail-fast
+      run: |
+        cmake --build . -- -property:Configuration=Debug -verbosity:minimal
+        Debug/pugixml-check.exe
+        cmake --build . -- -property:Configuration=Release -verbosity:minimal
+        Release/pugixml-check.exe