diff --git a/ghc/compiler/reader/Lex.lhs b/ghc/compiler/reader/Lex.lhs
index 0affa575c0c39c1e2c82dd7a442d3dc1d1f80b3c..a634f50289622eed1fe15480d4934d900a690edb 100644
--- a/ghc/compiler/reader/Lex.lhs
+++ b/ghc/compiler/reader/Lex.lhs
@@ -60,7 +60,7 @@ import StringBuffer
 import PreludeGlaST 
 #else
 import GlaExts
-#if __GLASGOW_HASKELL__ <= 209
+#if __GLASGOW_HASKELL__ < 209
 import ST ( thenST, seqST )
 #endif
 #endif