diff --git a/reframe/core/modules.py b/reframe/core/modules.py
index 35460e1695..df09860c99 100644
--- a/reframe/core/modules.py
+++ b/reframe/core/modules.py
@@ -575,6 +575,11 @@ def conflicted_modules(self, module):
 
         return ret
 
+    def unload_all(self):
+        # Currently, we don't take any provision for sticky modules in Lmod, so
+        # we forcefully unload everything.
+        self._exec_module_command('--force', 'purge')
+
 
 class NoModImpl(ModulesSystemImpl):
     """A convenience class that implements a no-op a modules system."""