diff --git a/src/apu.c b/src/apu.c
index d79ac4b..c53d616 100644
--- a/src/apu.c
+++ b/src/apu.c
@@ -54,8 +54,8 @@ apu_render(Apu *c, Sint16 *sample, Sint16 *end)
 			c->i %= c->len;
 		}
 		s = (Sint8)(c->addr[c->i]) * envelope(c, c->age++);
-		*sample++ += s * c->volume_l / 0x80;
-		*sample++ += s * c->volume_r / 0x80;
+		*sample++ += s * c->volume_l / 0x180;
+		*sample++ += s * c->volume_r / 0x180;
 	}
 }