diff --git a/WINGs/wevent_wl.c b/WINGs/wevent_wl.c
index b1e438c..f2d5822 100644
--- a/WINGs/wevent_wl.c
+++ b/WINGs/wevent_wl.c
@@ -377,8 +377,14 @@ static void wl_keysym_convert_case(void *ectx, WMNativeKeysym sym,
 static void wl_send_wm_command(void *ectx, const char *cmd)
 {
     (void)ectx;
-    if (cmd && strcmp(cmd, "Reconfigure") == 0)
-        kill(getppid(), SIGUSR2);
+    if (cmd && strcmp(cmd, "Reconfigure") == 0) {
+        const char *pidstr = getenv("WMAKER_PID");
+        if (pidstr) {
+            pid_t pid = (pid_t)atoi(pidstr);
+            if (pid > 0)
+                kill(pid, SIGUSR2);
+        }
+    }
 }
 
 static void wl_set_window_hints(void *ectx, WNativeWindow w,
diff --git a/src/main.c b/src/main.c
index abccfda..36143a2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -622,6 +622,11 @@ static int real_main(int argc, char **argv)
 
 	/* for telling WPrefs what's the name of the wmaker binary being ran */
 	setenv("WMAKER_BIN_NAME", argv[0], 1);
+	{
+		char pidbuf[16];
+		snprintf(pidbuf, sizeof(pidbuf), "%d", (int)getpid());
+		setenv("WMAKER_PID", pidbuf, 1);
+	}
 
 	ArgCount = argc;
 	Arguments = wmalloc(sizeof(char *) * (ArgCount + 1));