diff --git a/regression.py b/regression.py
index 2e5b7a2d3..fd0a6fdfe 100644
--- a/regression.py
+++ b/regression.py
@@ -84,7 +84,7 @@ class regression_test_task(Task.TaskBase):
             program = getattr(mod, "program", short_name)
 
         if hasattr(mod, 'may_run'):
-            reason_cannot_run = mod.may_run(self.env)
+            reason_cannot_run = mod.may_run(self.env, Options.options)
         else:
             reason_cannot_run = None
         if reason_cannot_run:
diff --git a/regression/tests/test-csma-bridge.py b/regression/tests/test-csma-bridge.py
index e0905d33e..245f5b6d1 100644
--- a/regression/tests/test-csma-bridge.py
+++ b/regression/tests/test-csma-bridge.py
@@ -4,7 +4,7 @@
 
 import os.path
 
-def may_run(env):
+def may_run(env, options):
     """Returns 0 when it can run, return non-zero or string (reason) when it cannot run"""
     if env['ENABLE_PYTHON_BINDINGS']:
         return 0
diff --git a/regression/tests/test-tcp-nsc-lfn.py b/regression/tests/test-tcp-nsc-lfn.py
index b58d4b227..aaa6436b4 100644
--- a/regression/tests/test-tcp-nsc-lfn.py
+++ b/regression/tests/test-tcp-nsc-lfn.py
@@ -5,10 +5,12 @@
 import platform
 
 
-def may_run(env):
+def may_run(env, options):
     if not env['NSC_ENABLED']:
         return "NSC not available"
     else:
+        if options.valgrind:
+            return "NSC does not get along with valgrind"
         return 0