diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 7d9e7d9..c59b386 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -19,9 +19,15 @@ jobs:
         include:
           - toolset: msvc-14.1
             cxxstd: "14,17,latest"
+            addrmd: 32,64
             os: windows-2016
           - toolset: msvc-14.2
             cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2019
+          - toolset: gcc
+            cxxstd: "03,11,14,17,2a"
+            addrmd: 64
             os: windows-2019
 
     runs-on: ${{matrix.os}}
@@ -48,4 +54,4 @@ jobs:
         shell: cmd
         run: |
           cd ../boost-root
-          b2 -j3 libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} variant=debug,release address-model=32,64
+          b2 -j3 libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release