diff --git a/core/unix/src/TUnixSystem.cxx b/core/unix/src/TUnixSystem.cxx
index 4db566f5b0ecc76595dc92da55906fe576dc73f6..65d1cb0b623dc1dbe2a1c1a95d2d51ca573a706b 100644
--- a/core/unix/src/TUnixSystem.cxx
+++ b/core/unix/src/TUnixSystem.cxx
@@ -3658,6 +3658,7 @@ void TUnixSystem::DispatchSignals(ESignals sig)
       Gl_windowchanged();
       break;
    case kSigUser2:
+      Break("TUnixSystem::DispatchSignals", "%s: printing stacktrace", UnixSigname(sig));
       StackTrace();
       // Intentional fall-through; pass the signal to handlers (or terminate):
    default: