diff --git a/tools/ci/gha-install.py b/tools/ci/gha-install.py
index f3a29273f..95fe70abe 100644
--- a/tools/ci/gha-install.py
+++ b/tools/ci/gha-install.py
@@ -56,6 +56,8 @@ def install(omp=False, mpi=False, phdf5=False, dagmc=False, libmesh=False, ncrys
 
     if ncrystal:
         cmake_cmd.append('-DOPENMC_USE_NCRYSTAL=ON')
+        ncrystal_path = os.environ.get('CMAKE_PREFIX_PATH')
+        cmake_cmd.append('-DCMAKE_PREFIX_PATH=' + ncrystal_path)
 
     # Build in coverage mode for coverage testing
     cmake_cmd.append('-DOPENMC_ENABLE_COVERAGE=on')