diff --git a/wxdata/source/scwx/wsr88d/rda/digital_radar_data.cpp b/wxdata/source/scwx/wsr88d/rda/digital_radar_data.cpp
index 6d840d79..37500ed6 100644
--- a/wxdata/source/scwx/wsr88d/rda/digital_radar_data.cpp
+++ b/wxdata/source/scwx/wsr88d/rda/digital_radar_data.cpp
@@ -297,7 +297,8 @@ DigitalRadarData::moment_data_block(DataBlockType type) const
 }
 
 DigitalRadarData::Impl::MomentDataBlock::MomentDataBlock(
-   const DigitalRadarData* self, DataBlockType type)
+   const DigitalRadarData* self, DataBlockType type) :
+    p(std::make_unique<Impl>())
 {
    switch (type)
    {