diff --git a/src/sound/snd_ad1848.c b/src/sound/snd_ad1848.c
index a1114c4be..0feb3ab74 100644
--- a/src/sound/snd_ad1848.c
+++ b/src/sound/snd_ad1848.c
@@ -65,7 +65,7 @@ ad1848_updatevolmask(ad1848_t *ad1848)
 static void
 ad1848_updatefreq(ad1848_t *ad1848)
 {
-    double  freq = 0;
+    double  freq = 0.0;
     uint8_t set  = 0;
 
     if (ad1848->type >= AD1848_TYPE_CS4235) {