diff --git a/hoot-core/src/main/cpp/hoot/core/ops/UnionPolygonsOp.cpp b/hoot-core/src/main/cpp/hoot/core/ops/UnionPolygonsOp.cpp
index 1322691..f3219bc 100644
--- a/hoot-core/src/main/cpp/hoot/core/ops/UnionPolygonsOp.cpp
+++ b/hoot-core/src/main/cpp/hoot/core/ops/UnionPolygonsOp.cpp
@@ -31,7 +31,7 @@
#include <hoot/core/elements/OsmMap.h>
#include <hoot/core/util/GeometryConverter.h>
#include <hoot/core/util/Log.h>
-#include <hoot/core/util/IoUtils.h>
+#include <hoot/core/io/IoUtils.h>
#include <hoot/core/visitors/WorstCircularErrorVisitor.h>
// geos