diff --git a/driver/quectel_MHI/src/controllers/mhi_qti.c b/driver/quectel_MHI/src/controllers/mhi_qti.c
index 21bcd04..9090fbb 100644
--- a/driver/quectel_MHI/src/controllers/mhi_qti.c
+++ b/driver/quectel_MHI/src/controllers/mhi_qti.c
@@ -430,6 +430,7 @@ rpm_resume_exit:
 	return ret;
 }
 
+#ifdef CONFIG_PM_SLEEP
 static int mhi_system_resume(struct device *dev)
 {
 	int ret = 0;
@@ -474,6 +475,7 @@ int mhi_system_suspend(struct device *dev)
 	return 0;
 }
 #endif
+#endif
 
 /* checks if link is down */
 static int mhi_link_status(struct mhi_controller *mhi_cntrl, void *priv)