diff --git a/src/mem/SConscript b/src/mem/SConscript
index 0f2efed4a3..cc149157b1 100644
--- a/src/mem/SConscript
+++ b/src/mem/SConscript
@@ -145,6 +145,7 @@ DebugFlag('MemCtrl')
 DebugFlag('MMU')
 DebugFlag('MemoryAccess')
 DebugFlag('PacketQueue')
+DebugFlag('ResponsePort')
 DebugFlag('StackDist')
 DebugFlag("DRAMSim2")
 DebugFlag("DRAMsim3")
diff --git a/src/mem/port.cc b/src/mem/port.cc
index ac586c2bb4..00f7ce6efa 100644
--- a/src/mem/port.cc
+++ b/src/mem/port.cc
@@ -45,6 +45,7 @@
 #include "mem/port.hh"
 
 #include "base/trace.hh"
+#include "debug/ResponsePort.hh"
 #include "sim/sim_object.hh"
 
 namespace gem5
@@ -197,7 +198,8 @@ Tick
 ResponsePort::recvAtomicBackdoor(PacketPtr pkt, MemBackdoorPtr &backdoor)
 {
     if (!defaultBackdoorWarned) {
-        warn("Port %s doesn't support requesting a back door.", name());
+        DPRINTF(ResponsePort,
+                "Port %s doesn't support requesting a back door.", name());
         defaultBackdoorWarned = true;
     }
     return recvAtomic(pkt);