diff --git a/config_tempest/main.py b/config_tempest/main.py
index 33337e29..5351a693 100755
--- a/config_tempest/main.py
+++ b/config_tempest/main.py
@@ -136,6 +136,11 @@ def read_deployer_input(deployer_input_file, conf):
     LOG.info("Adding options from deployer-input file '%s'",
              deployer_input_file)
     deployer_input = configparser.ConfigParser()
+    # the following transforms the option names as found in an input file,
+    # the default implementation returns a lower-case version of the
+    # option names, however, we have at least one option that contains
+    # capitalized letters - RBAC_test_type from octavia-tempest-plugin
+    deployer_input.optionxform = str
     deployer_input.read(deployer_input_file)
     for section in deployer_input.sections():
         # There are no deployer input options in DEFAULT