diff --git a/bytestring-strict-builder.cabal b/bytestring-strict-builder.cabal
--- a/bytestring-strict-builder.cabal
+++ b/bytestring-strict-builder.cabal
@@ -1,5 +1,5 @@
 name: bytestring-strict-builder
-version: 0.4.5.4
+version: 0.4.5.5
 category: Text, ByteString, Builders, Serialization
 synopsis: An efficient strict bytestring builder
 description:
diff --git a/library/ByteString/StrictBuilder/Population/UncheckedShifting.hs b/library/ByteString/StrictBuilder/Population/UncheckedShifting.hs
--- a/library/ByteString/StrictBuilder/Population/UncheckedShifting.hs
+++ b/library/ByteString/StrictBuilder/Population/UncheckedShifting.hs
@@ -62,8 +62,13 @@
 #endif
 
 #if !defined(__HADDOCK__)
+#if MIN_VERSION_base(4,16,0)
+shiftr_w16 (W16# w) (I# i) = W16# (w `uncheckedShiftRLWord16#`   i)
+shiftr_w32 (W32# w) (I# i) = W32# (w `uncheckedShiftRLWord32#`   i)
+#else
 shiftr_w16 (W16# w) (I# i) = W16# (w `uncheckedShiftRL#`   i)
 shiftr_w32 (W32# w) (I# i) = W32# (w `uncheckedShiftRL#`   i)
+#endif
 
 #if WORD_SIZE_IN_BITS < 64
 shiftr_w64 (W64# w) (I# i) = W64# (w `uncheckedShiftRL64#` i)