diff --git a/Data/ByteString/Builder/RealFloat/Internal.hs b/Data/ByteString/Builder/RealFloat/Internal.hs
index 064aefec7..9dac7825b 100644
--- a/Data/ByteString/Builder/RealFloat/Internal.hs
+++ b/Data/ByteString/Builder/RealFloat/Internal.hs
@@ -86,7 +86,7 @@ import qualified Foreign.Storable as S (poke)
 #include <ghcautoconf.h>
 #include "MachDeps.h"
 
-#if WORD_SIZE_IN_BITS < 64 && __GLASGOW_HASKELL__ < 903
+#if WORD_SIZE_IN_BITS < 64 && !MIN_VERSION_ghc_prim(0,8,0)
 import GHC.IntWord64
 #endif