diff --git a/iso/builder/build-cublas.sh b/iso/builder/build-cublas.sh
index 386d2dd..0716fac 100644
--- a/iso/builder/build-cublas.sh
+++ b/iso/builder/build-cublas.sh
@@ -28,6 +28,7 @@ PACKAGES_GZ="${DOWNLOAD_CACHE_DIR}/Packages.gz"
 echo "=== cuBLAS ${CUBLAS_VERSION} / cudart ${CUDA_USERSPACE_VERSION} / CUDA ${CUDA_SERIES} ==="
 
 if [ -f "${CACHE_DIR}/include/cublasLt.h" ] && [ -f "${CACHE_DIR}/include/cuda_runtime_api.h" ] \
+    && [ -f "${CACHE_DIR}/include/crt/host_defines.h" ] \
     && [ "$(find "${CACHE_DIR}/lib" \( -name 'libcublas.so*' -o -name 'libcublasLt.so*' -o -name 'libcudart.so*' \) 2>/dev/null | wc -l)" -gt 0 ]; then
     echo "=== cuBLAS cached, skipping download ==="
     echo "cache: $CACHE_DIR"
@@ -155,14 +156,17 @@ CUBLAS_RT_DEB=$(download_verified_pkg "libcublas-${CUDA_SERIES_DASH}" "${CUBLAS_
 CUBLAS_DEV_DEB=$(download_verified_pkg "libcublas-dev-${CUDA_SERIES_DASH}" "${CUBLAS_VERSION}")
 CUDART_RT_DEB=$(download_verified_pkg "cuda-cudart-${CUDA_SERIES_DASH}" "${CUDA_USERSPACE_VERSION}")
 CUDART_DEV_DEB=$(download_verified_pkg "cuda-cudart-dev-${CUDA_SERIES_DASH}" "${CUDA_USERSPACE_VERSION}")
+CUDA_CRT_DEB=$(download_verified_pkg "cuda-crt-${CUDA_SERIES_DASH}" "${CUDA_USERSPACE_VERSION}")
 
 extract_deb "$CUBLAS_RT_DEB" "${TMP_DIR}/cublas-rt"
 extract_deb "$CUBLAS_DEV_DEB" "${TMP_DIR}/cublas-dev"
 extract_deb "$CUDART_RT_DEB" "${TMP_DIR}/cudart-rt"
 extract_deb "$CUDART_DEV_DEB" "${TMP_DIR}/cudart-dev"
+extract_deb "$CUDA_CRT_DEB" "${TMP_DIR}/cuda-crt"
 
 copy_headers "${TMP_DIR}/cublas-dev"
 copy_headers "${TMP_DIR}/cudart-dev"
+copy_headers "${TMP_DIR}/cuda-crt"
 copy_libs "${TMP_DIR}/cublas-rt"
 copy_libs "${TMP_DIR}/cudart-rt"