diff --git a/tests/uefi-test-tools/build.sh b/tests/uefi-test-tools/build.sh
index e2b52c855c..8aa7935c43 100755
--- a/tests/uefi-test-tools/build.sh
+++ b/tests/uefi-test-tools/build.sh
@@ -29,6 +29,9 @@ export PACKAGES_PATH=$(realpath -- "$edk2_dir")
 export WORKSPACE=$PWD
 mkdir -p Conf
 
+# Work around <https://bugzilla.tianocore.org/show_bug.cgi?id=1607>.
+export PYTHON_COMMAND=python2
+
 # Source "edksetup.sh" carefully.
 set +e +u +C
 source "$PACKAGES_PATH/edksetup.sh"