diff --git a/src/backend/cpu_policies_gatekeeper.cc b/src/backend/cpu_policies_gatekeeper.cc
index f85d143..00225b8 100644
--- a/src/backend/cpu_policies_gatekeeper.cc
+++ b/src/backend/cpu_policies_gatekeeper.cc
@@ -29,6 +29,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <iostream>
 
 using std::vector;
 using std::map;
@@ -123,6 +124,7 @@ CPUPoliciesGatekeeper::activate_policy(History *history, CPUPolicy* policy)
     }
     catch(const CPUPolicyException& e)
     {
+      std::cerr << e.what() << std::endl;
       // See the comment above to understand why we do this
       // in this way
       _active_policies.erase(_active_policies.find(history));