diff --git a/cli/koji_cli/commands.py b/cli/koji_cli/commands.py
index 69b262d7..bbcab1f7 100644
--- a/cli/koji_cli/commands.py
+++ b/cli/koji_cli/commands.py
@@ -1174,6 +1174,8 @@ def anon_handle_mock_config(goptions, session, args):
     if 'mock.bootstrap_image' in buildcfg['extra']:
         opts['use_bootstrap_image'] = True
         opts['bootstrap_image'] = buildcfg['extra']['mock.bootstrap_image']
+    else:
+        opts['use_bootstrap_image'] = False
     if 'mock.use_bootstrap' in buildcfg['extra']:
         opts['use_bootstrap'] = buildcfg['extra']['mock.use_bootstrap']
     if 'mock.module_setup_commands' in buildcfg['extra']:
diff --git a/koji/__init__.py b/koji/__init__.py
index 37fb4286..cd8f91fb 100644
--- a/koji/__init__.py
+++ b/koji/__init__.py
@@ -1815,6 +1815,8 @@ def genMockConfig(name, arch, managed=False, repoid=None, tag_name=None, **opts)
     if opts.get('bootstrap_image'):
         config_opts['use_bootstrap_image'] = True
         config_opts['bootstrap_image'] = opts['bootstrap_image']
+    else:
+        config_opts['use_bootstrap_image'] = False
     if 'use_bootstrap' in opts:
         config_opts['use_bootstrap'] = bool(opts['use_bootstrap'])
     if 'module_setup_commands' in opts: