diff --git a/.github/workflows/reusable.yml b/.github/workflows/reusable.yml
index 9e136ae8..c091ef62 100644
--- a/.github/workflows/reusable.yml
+++ b/.github/workflows/reusable.yml
@@ -132,8 +132,8 @@ jobs:
           all_jobs = [
             # libstdc++ (by default: disabled (see exclude_cxxstd, exclude_compiler),
             #            tests are pre-C++11 standard; gcc-4.7 is not fully compliant)
-              {"compiler": "gcc-4.4",   "cxxstd": "98",                "os": "ubuntu-latest", "container": "ubuntu:16.04"},
-              {"compiler": "gcc-4.6",   "cxxstd": "03,0x",             "os": "ubuntu-latest", "container": "ubuntu:16.04"},
+              {"compiler": "gcc-4.4",   "cxxstd": "98",                "os": "ubuntu-latest", "container": "ubuntu:16.04", "source_keys": "0x1E9377A2BA9EF27F", "sources": "ppa:ubuntu-toolchain-r/test"},
+              {"compiler": "gcc-4.6",   "cxxstd": "03,0x",             "os": "ubuntu-latest", "container": "ubuntu:16.04", "source_keys": "0x1E9377A2BA9EF27F", "sources": "ppa:ubuntu-toolchain-r/test"},
               {"compiler": "gcc-4.7",   "cxxstd": "03,11",             "os": "ubuntu-latest", "container": "ubuntu:16.04"},
             # libstdc++
               {"compiler": "gcc-4.7",   "cxxstd": "11",                "os": "ubuntu-latest", "container": "ubuntu:16.04"},
@@ -372,9 +372,6 @@ jobs:
         run: |
             SOURCE_KEYS=("${{join(matrix.source_keys, '" "')}}")
             SOURCES=("${{join(matrix.sources, '" "')}}")
-            # Add this by default
-            SOURCE_KEYS+=('0x1E9377A2BA9EF27F')
-            SOURCES+=(ppa:ubuntu-toolchain-r/test)
 
             ci/add-apt-keys.sh "${SOURCE_KEYS[@]}"
             # Initial update before adding sources required to get e.g. keys