diff --git a/include/osmocom/ctrl/control_cmd.h b/include/osmocom/ctrl/control_cmd.h
index 93055c7ce..276a7def5 100644
--- a/include/osmocom/ctrl/control_cmd.h
+++ b/include/osmocom/ctrl/control_cmd.h
@@ -12,6 +12,7 @@
 #define CTRL_CMD_ERROR		-1
 #define CTRL_CMD_HANDLED	0
 #define CTRL_CMD_REPLY		1
+#define CTRL_CMD_TRAP_ID	"0"
 
 struct ctrl_handle;
 
diff --git a/src/ctrl/control_if.c b/src/ctrl/control_if.c
index 1121d07fd..0209f3bed 100644
--- a/src/ctrl/control_if.c
+++ b/src/ctrl/control_if.c
@@ -156,7 +156,7 @@ int ctrl_cmd_send_trap(struct ctrl_handle *ctrl, const char *name, char *value)
 	if (!cmd)
 		return -ENOMEM;
 
-	cmd->id = "0"; /* It's a TRAP! */
+	cmd->id = CTRL_CMD_TRAP_ID; /* It's a TRAP! */
 	cmd->variable = (char *) name;
 	cmd->reply = value;
 	r = ctrl_cmd_send_to_all(ctrl, cmd);