diff --git a/common/install_conda.sh b/common/install_conda.sh
index 1027115c0..c7967a615 100644
--- a/common/install_conda.sh
+++ b/common/install_conda.sh
@@ -5,7 +5,8 @@ set -ex
 # Anaconda
 wget -q https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
 chmod +x  Miniconda3-latest-Linux-x86_64.sh
-./Miniconda3-latest-Linux-x86_64.sh -b -p /opt/conda
+# NB: Manually invoke bash per https://github.com/conda/conda/issues/10431
+bash ./Miniconda3-latest-Linux-x86_64.sh -b -p /opt/conda
 rm Miniconda3-latest-Linux-x86_64.sh
 export PATH=/opt/conda/bin:$PATH
 conda install -y conda-build anaconda-client git ninja
diff --git a/common/install_cpython.sh b/common/install_cpython.sh
old mode 100755
new mode 100644