diff --git a/mpp/legacy/vpu_api.cpp b/mpp/legacy/vpu_api.cpp
index 5b5c0975..f3868ac4 100644
--- a/mpp/legacy/vpu_api.cpp
+++ b/mpp/legacy/vpu_api.cpp
@@ -305,6 +305,7 @@ RK_S32 vpu_open_context(VpuCodecContext **ctx)
     EXtraCfg_t extra_cfg;
     memset(&extra_cfg, 0, sizeof(EXtraCfg_t));
 
+    mpp_env_get_u32("vpu_api_debug", &vpu_api_debug, VPU_API_DBG_FUNCTION);
     vpu_api_dbg_func("enter\n");
 
     mpp_env_get_u32("use_original", &force_original, 0);
diff --git a/mpp/legacy/vpu_api_legacy.cpp b/mpp/legacy/vpu_api_legacy.cpp
index 41fd2c06..a66c5e29 100644
--- a/mpp/legacy/vpu_api_legacy.cpp
+++ b/mpp/legacy/vpu_api_legacy.cpp
@@ -345,8 +345,6 @@ VpuApiLegacy::VpuApiLegacy() :
     fd_output(-1),
     mEosSet(0)
 {
-    mpp_env_get_u32("vpu_api_debug", &vpu_api_debug, 0);
-
     vpu_api_dbg_func("enter\n");
 
     mpp_create(&mpp_ctx, &mpi);