diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8a97af1d..dae05174 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -96,7 +96,7 @@ jobs:
         run: |
           install_cmdstan -h
           install_cxx_toolchain -h
-          O=g python -c "import cmdstanpy; cmdstanpy.install_cmdstan(version='${{ needs.get-cmdstan-version.outputs.version }}', cores=4, verbose=True)"
+          python -c "import cmdstanpy; cmdstanpy.install_cmdstan(version='${{ needs.get-cmdstan-version.outputs.version }}', cores=4, verbose=True)"
 
       - name: Install CmdStan (Windows)
         if: matrix.os == 'windows-latest'
diff --git a/cmdstanpy/stanfit/mcmc.py b/cmdstanpy/stanfit/mcmc.py
index 8c93c8e3..888957f4 100644
--- a/cmdstanpy/stanfit/mcmc.py
+++ b/cmdstanpy/stanfit/mcmc.py
@@ -526,6 +526,10 @@ def summary(
         if cmdstan_version_before(2, 24):
             csv_str = '--csv_file={}'.format(tmp_csv_path)
         cmd = [
+            "gdb",
+            "--ex",
+            "r",
+            "--args",
             cmd_path,
             percentiles_str,
             sig_figs_str,