diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0d77b4dc6b..1e6c356e4a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
             os: ubuntu-18.04
           - toolset: clang
             compiler: clang++-3.5
-            cxxstd: "11,14"
+            cxxstd: "11"
             define: "_GLIBCXX_USE_CXX11_ABI=0"
             os: ubuntu-16.04
             install: clang-3.5