diff --git a/lib/wrappers/postgres.nim b/lib/wrappers/postgres.nim
index 0bde3f1e6e..cb23076f6a 100644
--- a/lib/wrappers/postgres.nim
+++ b/lib/wrappers/postgres.nim
@@ -27,6 +27,10 @@ elif defined(macosx):
 else:
   const
     dllName = "libpq.so(.5|)"
+    
+when defined(nimPreviewSlimSystem):
+  import std/syncio
+
 type
   POid* = ptr Oid
   Oid* = int32