diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index ef976420b..8a92f954a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -170,7 +170,7 @@ jobs:
           ref: hdf5-1_14_3
           path: hdf5-1_14_3
       - name: Build HDF5
-        if: matrix.hdf5 == 'HDF5' && matrix.distro == 'ubuntu:latest' && matrix.cxx == 'g++'' && matrix.backend == 'THREADS'
+        if: matrix.hdf5 == 'HDF5' && matrix.distro == 'ubuntu:latest' && matrix.cxx == 'g++' && matrix.backend == 'THREADS'
         working-directory: hdf5-1_14_3
         run: |
           mkdir hdf5