diff --git a/src/openalpr/textdetection/characteranalysis.h b/src/openalpr/textdetection/characteranalysis.h
index 03ce496..a8c5bcc 100644
--- a/src/openalpr/textdetection/characteranalysis.h
+++ b/src/openalpr/textdetection/characteranalysis.h
@@ -56,8 +56,6 @@ namespace alpr
       PipelineData* pipeline_data;
       Config* config;
 
-      cv::Mat findOuterBoxMask( );
-
       bool isPlateInverted();
       void filter(cv::Mat img, TextContours& textContours);