diff --git a/botany.py b/botany.py
index 6d199c8..63f7046 100755
--- a/botany.py
+++ b/botany.py
@@ -174,10 +174,10 @@ class Plant(object):
         # Generate plant rarity
         CONST_RARITY_MAX = 256.0
         rare_seed = random.randint(1,CONST_RARITY_MAX)
-        common_range =    round((2/3)*CONST_RARITY_MAX)
-        uncommon_range =  round((2/3)*(CONST_RARITY_MAX-common_range))
-        rare_range =      round((2/3)*(CONST_RARITY_MAX-common_range-uncommon_range))
-        legendary_range = round((2/3)*(CONST_RARITY_MAX-common_range-uncommon_range-rare_range))
+        common_range =    round((2.0/3)*CONST_RARITY_MAX)
+        uncommon_range =  round((2.0/3)*(CONST_RARITY_MAX-common_range))
+        rare_range =      round((2.0/3)*(CONST_RARITY_MAX-common_range-uncommon_range))
+        legendary_range = round((2.0/3)*(CONST_RARITY_MAX-common_range-uncommon_range-rare_range))
 
         common_max = common_range
         uncommon_max = common_max + uncommon_range