diff --git a/easybuild/framework/extension.py b/easybuild/framework/extension.py
index 22f2b9f42e..39655499fa 100644
--- a/easybuild/framework/extension.py
+++ b/easybuild/framework/extension.py
@@ -38,6 +38,7 @@
 import copy
 import os
 
+from easybuild.framework.easyconfig.default import get_easyconfig_parameter_default
 from easybuild.framework.easyconfig.easyconfig import resolve_template
 from easybuild.framework.easyconfig.templates import TEMPLATE_NAMES_EASYBLOCK_RUN_STEP, template_constant_dict
 from easybuild.tools.build_log import EasyBuildError, EasyBuildExit, raise_nosupport
@@ -107,10 +108,19 @@ def __init__(self, mself, ext, extra_params=None):
 
         name, version = self.ext['name'], self.ext.get('version', None)
 
-        # parent sanity check paths/commands and postinstallcmds are not relevant for extension
-        self.cfg['sanity_check_commands'] = []
-        self.cfg['sanity_check_paths'] = []
-        self.cfg['postinstallcmds'] = []
+        # Reset some options that should not be inherited from the parent
+        restore_options = (
+            'checksums',
+            'data_sources',
+            'patches',
+            'postinstallcmds',
+            'sanity_check_commands',
+            'sanity_check_paths',
+            'skipsteps',
+            'sources',
+        )
+        for opt_name in restore_options:
+            self.cfg[opt_name] = get_easyconfig_parameter_default(opt_name)
 
         # construct dict with template values that can be used
         self.cfg.template_values.update(template_constant_dict({'name': name, 'version': version}))