diff --git a/source/application/api/use_case/ad/src/AdProcessing.cc b/source/application/api/use_case/ad/src/AdProcessing.cc
index fb26a83..5a85e96 100644
--- a/source/application/api/use_case/ad/src/AdProcessing.cc
+++ b/source/application/api/use_case/ad/src/AdProcessing.cc
@@ -164,7 +164,7 @@
                      size_t cacheSize,
                      float trainingMean)
 {
-    std::function<void (std::vector<int16_t>&, size_t, bool, size_t, size_t)> melSpecFeatureCalc;
+    std::function<void (std::vector<int16_t>&, size_t, bool, size_t, size_t)> melSpecFeatureCalc = nullptr;
 
     TfLiteQuantization quant = inputTensor->quantization;
 
diff --git a/source/application/api/use_case/kws/src/KwsProcessing.cc b/source/application/api/use_case/kws/src/KwsProcessing.cc
index 40de498..2d5c085 100644
--- a/source/application/api/use_case/kws/src/KwsProcessing.cc
+++ b/source/application/api/use_case/kws/src/KwsProcessing.cc
@@ -158,7 +158,7 @@
     std::function<void (std::vector<int16_t>&, int, bool, size_t)>
     KwsPreProcess::GetFeatureCalculator(audio::MicroNetKwsMFCC& mfcc, TfLiteTensor* inputTensor, size_t cacheSize)
     {
-        std::function<void (std::vector<int16_t>&, size_t, bool, size_t)> mfccFeatureCalc;
+        std::function<void (std::vector<int16_t>&, size_t, bool, size_t)> mfccFeatureCalc = nullptr;
 
         TfLiteQuantization quant = inputTensor->quantization;