diff --git a/server/mach.c b/server/mach.c
index ec121e2e52f..111953c773a 100644
--- a/server/mach.c
+++ b/server/mach.c
@@ -243,6 +243,8 @@ int send_thread_signal( struct thread *thread, int sig )
             thread->unix_tid = -1;
         }
     }
+    if (debug_level && ret != -1)
+        fprintf( stderr, "%04x: *sent signal* signal=%d\n", thread->id, sig );
     return (ret != -1);
 }
 
diff --git a/server/ptrace.c b/server/ptrace.c
index 37c15c027a9..14a29f52cac 100644
--- a/server/ptrace.c
+++ b/server/ptrace.c
@@ -262,6 +262,8 @@ int send_thread_signal( struct thread *thread, int sig )
             thread->unix_tid = -1;
         }
     }
+    if (debug_level && ret != -1)
+        fprintf( stderr, "%04x: *sent signal* signal=%d\n", thread->id, sig );
     return (ret != -1);
 }