diff --git a/modules/dnn/src/layers/normalize_bbox_layer.cpp b/modules/dnn/src/layers/normalize_bbox_layer.cpp
index b8bcb8097..948f5c6fc 100644
--- a/modules/dnn/src/layers/normalize_bbox_layer.cpp
+++ b/modules/dnn/src/layers/normalize_bbox_layer.cpp
@@ -96,7 +96,7 @@ T NormalizeBBoxLayer::getParameter(const LayerParams &params,
 
 NormalizeBBoxLayer::NormalizeBBoxLayer(LayerParams &params) : Layer(params)
 {
-    _eps = getParameter<float>(params, "eps", 0, false, 1e-10);
+    _eps = getParameter<float>(params, "eps", 0, false, 1e-10f);
     _across_spatial = getParameter<bool>(params, "across_spatial");
     _channel_shared = getParameter<bool>(params, "channel_shared");
 }
diff --git a/modules/dnn/src/layers/prior_box_layer.cpp b/modules/dnn/src/layers/prior_box_layer.cpp
index be4227c76..bc3024d45 100644
--- a/modules/dnn/src/layers/prior_box_layer.cpp
+++ b/modules/dnn/src/layers/prior_box_layer.cpp
@@ -153,7 +153,7 @@ void PriorBoxLayer::getVariance(const LayerParams &params)
         else
         {
             // Set default to 0.1.
-            _variance.push_back(0.1);
+            _variance.push_back(0.1f);
         }
     }
 }
@@ -211,8 +211,6 @@ void PriorBoxLayer::allocate(const std::vector<Blob*> &inputs, std::vector<Blob>
 
 void PriorBoxLayer::forward(std::vector<Blob*> &inputs, std::vector<Blob> &outputs)
 {
-    (void)inputs; // to suppress unused parameter warning
-
     float* outputPtr = outputs[0].ptrf();
 
     // first prior: aspect_ratio = 1, size = min_size