diff --git a/.github/workflows/dynamic_arch.yml b/.github/workflows/dynamic_arch.yml
index 5ba13881c..e6c5f39d8 100644
--- a/.github/workflows/dynamic_arch.yml
+++ b/.github/workflows/dynamic_arch.yml
@@ -202,7 +202,6 @@ jobs:
 
     env:
       CHERE_INVOKING: 1
-      OPENBLAS_CORETYPE: HASWELL
 
     steps:
       - name: Get CPU name
@@ -269,8 +268,6 @@ jobs:
                 -DUSE_THREAD=ON \
                 -DNUM_THREADS=64 \
                 -DTARGET=CORE2 \
-                -DCMAKE_Fortran_FLAGS_RELEASE=-O1 \
-                -DCMAKE_C_FLAGS_RELEASE=-O1 \
                 -DCMAKE_VERBOSE_MAKEFILE=ON \
                 ${{ matrix.idx64-flags }} \
                 -DCMAKE_C_COMPILER_LAUNCHER=ccache \