diff --git a/third_party/bouffalolab/bl702/bl_iot_sdk.gni b/third_party/bouffalolab/bl702/bl_iot_sdk.gni
index c20d395b83e111..7e85709ce7b714 100644
--- a/third_party/bouffalolab/bl702/bl_iot_sdk.gni
+++ b/third_party/bouffalolab/bl702/bl_iot_sdk.gni
@@ -66,7 +66,7 @@ template("bl_iot_sdk") {
 
     if (defined(invoker.enable_debug_frame_ptr) &&
         invoker.enable_debug_frame_ptr) {
-      cflags = [ "-fno-omit-frame-pointer" ]
+      cflags += [ "-fno-omit-frame-pointer" ]
     }
   }
 
diff --git a/third_party/bouffalolab/bl702l/bl_iot_sdk.gni b/third_party/bouffalolab/bl702l/bl_iot_sdk.gni
index 2a3bd679a951b9..932f97dd19fb25 100644
--- a/third_party/bouffalolab/bl702l/bl_iot_sdk.gni
+++ b/third_party/bouffalolab/bl702l/bl_iot_sdk.gni
@@ -66,7 +66,7 @@ template("bl_iot_sdk") {
 
     if (defined(invoker.enable_debug_frame_ptr) &&
         invoker.enable_debug_frame_ptr) {
-      cflags = [ "-fno-omit-frame-pointer" ]
+      cflags += [ "-fno-omit-frame-pointer" ]
     }
   }