diff --git a/wxdata/source/scwx/wsr88d/rpg/product_description_block.cpp b/wxdata/source/scwx/wsr88d/rpg/product_description_block.cpp
index ee0726c7..4bcd24fb 100644
--- a/wxdata/source/scwx/wsr88d/rpg/product_description_block.cpp
+++ b/wxdata/source/scwx/wsr88d/rpg/product_description_block.cpp
@@ -1028,7 +1028,7 @@ ProductDescriptionBlock::data_value(std::uint8_t level) const
          }
          else
          {
-            f = std::expf((level - log_offset()) / log_scale());
+            f = expf((level - log_offset()) / log_scale());
          }
          break;