diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c9b8470cf..1290b71f2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -158,7 +158,7 @@ jobs:
             pybind11_ver: v2.10.0
             simd: avx2,f16c
             skip_tests: 1
-            setenvs: export OSL_CMAKE_FLAGS="-DUSE_OPTIX=1" OPTIX_VERSION=7.0
+            setenvs: export OSL_CMAKE_FLAGS="-DOSL_USE_OPTIX=1" OPTIX_VERSION=7.0
                             OPENIMAGEIO_CMAKE_FLAGS=-DBUILD_FMT_VERSION=9.1.0
           - desc: oldest everything gcc6/C++14 llvm9 py2.7 boost1.66 oiio2.3 no-simd exr2.3
             nametag: linux-oldest
diff --git a/src/cmake/cuda_macros.cmake b/src/cmake/cuda_macros.cmake
index e66160309..519d24707 100644
--- a/src/cmake/cuda_macros.cmake
+++ b/src/cmake/cuda_macros.cmake
@@ -73,7 +73,7 @@ function ( MAKE_CUDA_BITCODE src suffix generated_bc extra_clang_args )
     foreach (def ${CURRENT_DEFINITIONS})
         set (LLVM_COMPILE_FLAGS ${LLVM_COMPILE_FLAGS} "-D${def}")
     endforeach()
-    set (LLVM_COMPILE_FLAGS ${LLVM_COMPILE_FLAGS} ${SIMD_COMPILE_FLAGS} ${CSTD_FLAGS})
+    set (LLVM_COMPILE_FLAGS ${LLVM_COMPILE_FLAGS} ${CSTD_FLAGS})
 
     # Setup the bitcode generator
     if (NOT LLVM_BC_GENERATOR)