diff --git a/lib/random.lua b/lib/random.lua
index b764c79..a9c29a8 100644
--- a/lib/random.lua
+++ b/lib/random.lua
@@ -48,9 +48,9 @@ local function random(n, m)
     local r
     if n then
         if m then
-            r = R(n, m)
+            r = math.floor(R() * (m - n) + n)
         else
-            r = R(n)
+            r = math.floor(R() * n)
         end
     else
         r = R()
diff --git a/src/mob.lua b/src/mob.lua
index 5db50b3..6ce6ff6 100644
--- a/src/mob.lua
+++ b/src/mob.lua
@@ -283,7 +283,7 @@ local function update_mob_spooder(mob, mob_index)
 
     -- passive animation
     if math.random() < 0.1 then
-        mob.node"rotate":action(am.tween(0.3, { angle = math.random(math.rad(0, -180))}))
+        mob.node"rotate":action(am.tween(0.3, { angle = math.random() * math.rad(0, -180)}))
     end
 end