diff --git a/compiler/ccgstmts.nim b/compiler/ccgstmts.nim
index a8ef8b31a..b25ad613c 100644
--- a/compiler/ccgstmts.nim
+++ b/compiler/ccgstmts.nim
@@ -873,4 +873,4 @@ proc genAsgn(p: BProc, e: PNode, fastAsgn: bool) =
 proc genStmts(p: BProc, t: PNode) = 
   var a: TLoc
   expr(p, t, a)
-  InternalAssert a.k notin {locNone, locTemp}
+  InternalAssert a.k in {locNone, locTemp}