diff --git a/NEWS b/NEWS
index ffb1a2ef2..083855fd6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,7 @@
 ver 0.20.23 (not yet released)
 * protocol
   - emit "player" idle event when restarting the current song
+* fix broken float to s32 conversion
 * new clang crash bug workaround
 
 ver 0.20.22 (2018/10/23)
diff --git a/src/pcm/FloatConvert.hxx b/src/pcm/FloatConvert.hxx
index 2270fbb90..70b00bcba 100644
--- a/src/pcm/FloatConvert.hxx
+++ b/src/pcm/FloatConvert.hxx
@@ -34,7 +34,7 @@ struct FloatToIntegerSampleConvert {
 	typedef typename SrcTraits::long_type SL;
 	typedef typename DstTraits::value_type DV;
 
-	static constexpr SV factor = 1 << (DstTraits::BITS - 1);
+	static constexpr SV factor = uintmax_t(1) << (DstTraits::BITS - 1);
 	static_assert(factor > 0, "Wrong factor");
 
 	gcc_const