diff --git a/hoot-core/src/main/cpp/hoot/core/scoring/RasterComparator.cpp b/hoot-core/src/main/cpp/hoot/core/scoring/RasterComparator.cpp
index fee4c46..b4b9cde 100644
--- a/hoot-core/src/main/cpp/hoot/core/scoring/RasterComparator.cpp
+++ b/hoot-core/src/main/cpp/hoot/core/scoring/RasterComparator.cpp
@@ -98,6 +98,8 @@ double RasterComparator::compareMaps()
_saveImage(image1, "test-output/image1.png", max);
_saveImage(image2, "test-output/image2.png", max);
+ cvReleaseImage(&diffImage);
+
return 1 - error;
}