diff --git a/Data/ODBC/src/Preparator.cpp b/Data/ODBC/src/Preparator.cpp
index 8e18fc8fe..0ea43a02f 100644
--- a/Data/ODBC/src/Preparator.cpp
+++ b/Data/ODBC/src/Preparator.cpp
@@ -80,7 +80,7 @@ void Preparator::freeMemory() const
 				break;
 
 			case DT_WCHAR:
-				deleteCachedArray<UTF16String>(it->first);
+				deleteCachedArray<UTF16String::value_type>(it->first);
 				break;
 
 			case DT_UCHAR: