diff --git a/build/darknet/yolo_console_dll.vcxproj b/build/darknet/yolo_console_dll.vcxproj
index 763914b0..a965fcaa 100644
--- a/build/darknet/yolo_console_dll.vcxproj
+++ b/build/darknet/yolo_console_dll.vcxproj
@@ -118,7 +118,7 @@
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>..\..\include;C:\opencv_source\opencv\bin\install\include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>OPENCV;_CRT_SECURE_NO_WARNINGS;_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ExceptionHandling>Async</ExceptionHandling>
       <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>