diff --git a/source/tool/malloc_test.cc b/source/tool/malloc_test.cc
index 453a24b7..cd540dc7 100644
--- a/source/tool/malloc_test.cc
+++ b/source/tool/malloc_test.cc
@@ -30,7 +30,7 @@ int main(
 
         while(true) {
             // Allocate the number of bytes, and de-allocate them again.
-            std::unique_ptr<int8_t>(new int8_t[nr_bytes]);
+            std::unique_ptr<int8_t[]>(new int8_t[nr_bytes]);
         }
     }
     catch(std::exception const& exception) {