diff --git a/sfxr.lua b/sfxr.lua
index 592d137..d2f21c5 100644
--- a/sfxr.lua
+++ b/sfxr.lua
@@ -459,7 +459,11 @@ end
 
 function sfxr.Sound:randomize(seed)
     if seed then setseed(seed) end
+
+    local wavetype = self.wavetype
     self:resetParameters()
+    self.wavetype = wavetype
+
     if maybe() then
         self.repeatspeed = random(0, 1)
     end