diff --git a/pdal/DbWriter.cpp b/pdal/DbWriter.cpp
index c4bdec84ad..5a57a94258 100644
--- a/pdal/DbWriter.cpp
+++ b/pdal/DbWriter.cpp
@@ -257,14 +257,14 @@ size_t DbWriter::readPoint(const PointView& view, PointId idx, char *outbuf)
     };
 
     if (m_xOffsets.first >= 0)
-        iconvert(m_scaling.m_xXform, Id::X, outbuf + m_xOffsets.first,
-            outbuf + m_xOffsets.second);
+        iconvert(m_scaling.m_xXform, Id::X, outbuf + (size_t)m_xOffsets.first,
+            outbuf + (size_t)m_xOffsets.second);
     if (m_yOffsets.first >= 0)
-        iconvert(m_scaling.m_yXform, Id::Y, outbuf + m_yOffsets.first,
-            outbuf + m_yOffsets.second);
+        iconvert(m_scaling.m_yXform, Id::Y, outbuf + (size_t)m_yOffsets.first,
+            outbuf + (size_t)m_yOffsets.second);
     if (m_zOffsets.first >= 0)
-        iconvert(m_scaling.m_zXform, Id::Z, outbuf + m_zOffsets.first,
-            outbuf + m_zOffsets.second);
+        iconvert(m_scaling.m_zXform, Id::Z, outbuf + (size_t)m_zOffsets.first,
+            outbuf + (size_t)m_zOffsets.second);
     return m_dbPointSize;
 }
 
diff --git a/pdal/DbWriter.hpp b/pdal/DbWriter.hpp
index 10b0c0cfe2..1ad0b45974 100644
--- a/pdal/DbWriter.hpp
+++ b/pdal/DbWriter.hpp
@@ -77,9 +77,9 @@ class PDAL_DLL DbWriter : public Writer
     XMLDimList m_dbDims;
     std::unordered_map<int, DimType> m_dimMap;
     Scaling m_scaling;
-    std::pair<size_t, size_t> m_xOffsets;
-    std::pair<size_t, size_t> m_yOffsets;
-    std::pair<size_t, size_t> m_zOffsets;
+    std::pair<int, int> m_xOffsets;
+    std::pair<int, int> m_yOffsets;
+    std::pair<int, int> m_zOffsets;
 
     StringList m_outputDims; ///< List of dimensions to write
     size_t m_packedPointSize; ///< Size of point data as read from PointTable.