diff --git a/ccv/saliency/fusion.cpp b/ccv/saliency/fusion.cpp
index 41ad29e..31a875c 100644
--- a/ccv/saliency/fusion.cpp
+++ b/ccv/saliency/fusion.cpp
@@ -51,7 +51,7 @@ cv::Mat max_fusion_generic(const std::vector<cv::Mat> feature_maps) {
     }
 
     if (first_value) {
-      C = f;
+      C = f.clone();
       first_value = false;
     }
     else {