diff --git a/meson.build b/meson.build
index c245c4562..98318db20 100644
--- a/meson.build
+++ b/meson.build
@@ -50,6 +50,7 @@ common_cxxflags = [
 
 test_common_flags = [
   '-Wvla',
+  '-Wdouble-promotion',
 
   '-fvisibility=hidden',
 
diff --git a/test/dump_rva2.cxx b/test/dump_rva2.cxx
index bd09edab2..9d07bfc26 100644
--- a/test/dump_rva2.cxx
+++ b/test/dump_rva2.cxx
@@ -41,7 +41,7 @@ DumpReplayGainTuple(const char *name, const ReplayGainTuple &tuple)
 {
 	if (tuple.IsDefined())
 		fprintf(stderr, "replay_gain[%s]: gain=%f peak=%f\n",
-			name, tuple.gain, tuple.peak);
+			name, (double)tuple.gain, (double)tuple.peak);
 }
 
 static void