diff --git a/src/wrappers/odbcsql.nim b/src/wrappers/odbcsql.nim
index 4e37e1a174..6b300c5ffe 100644
--- a/src/wrappers/odbcsql.nim
+++ b/src/wrappers/odbcsql.nim
@@ -7,6 +7,9 @@
 #    distribution, for details about the copyright.
 #
 
+when defined(nimPreviewSlimSystem):
+  import std/widestrs
+
 when not defined(ODBCVER):
   const
     ODBCVER = 0x0351 ## define ODBC version 3.51 by default