diff --git a/src/CalcManager/UnitConverter.h b/src/CalcManager/UnitConverter.h
index 3f323c35..3372d649 100644
--- a/src/CalcManager/UnitConverter.h
+++ b/src/CalcManager/UnitConverter.h
@@ -51,7 +51,7 @@ namespace UnitConversionManager
     // null checks.
     //
     // unitId, name, abbreviation, isConversionSource, isConversionTarget, isWhimsical
-    const Unit EMPTY_UNIT = Unit{ -1, L"", L"", true, true, false };
+    extern __declspec(selectany) const Unit EMPTY_UNIT = Unit{ -1, L"", L"", true, true, false };
 
     struct Category
     {