diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d2483e2b10..99fc8b0777 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -469,6 +469,7 @@ jobs:
           cd build
           export GGML_VK_VISIBLE_DEVICES=0
           export GGML_VK_DISABLE_F16=1
+          export GGML_VK_DISABLE_COOPMAT=1
           # This is using llvmpipe and runs slower than other backends
           ctest -L main --verbose --timeout 4800