diff --git a/src/main/java/world/bentobox/caveblock/CaveBlock.java b/src/main/java/world/bentobox/caveblock/CaveBlock.java
index 9d795cf..d0e4cb4 100644
--- a/src/main/java/world/bentobox/caveblock/CaveBlock.java
+++ b/src/main/java/world/bentobox/caveblock/CaveBlock.java
@@ -200,12 +200,24 @@ public class CaveBlock extends GameModeAddon
 
     private void setSpawnRates(World w) {
         if (w != null) {
-            w.setMonsterSpawnLimit(getSettings().getSpawnLimitMonsters());
-            w.setAmbientSpawnLimit(getSettings().getSpawnLimitAmbient());
-            w.setAnimalSpawnLimit(getSettings().getSpawnLimitAnimals());
-            w.setWaterAnimalSpawnLimit(getSettings().getSpawnLimitWaterAnimals());
-            w.setTicksPerAnimalSpawns(getSettings().getTicksPerAnimalSpawns());
-            w.setTicksPerMonsterSpawns(getSettings().getTicksPerMonsterSpawns());
+            if (getSettings().getSpawnLimitMonsters() > 0) {
+                w.setMonsterSpawnLimit(getSettings().getSpawnLimitMonsters());
+            }
+            if (getSettings().getSpawnLimitAmbient() > 0) {
+                w.setAmbientSpawnLimit(getSettings().getSpawnLimitAmbient());
+            }
+            if (getSettings().getSpawnLimitAnimals() > 0) {
+                w.setAnimalSpawnLimit(getSettings().getSpawnLimitAnimals());
+            }
+            if (getSettings().getSpawnLimitWaterAnimals() > 0) {
+                w.setWaterAnimalSpawnLimit(getSettings().getSpawnLimitWaterAnimals());
+            }
+            if (getSettings().getTicksPerAnimalSpawns() > 0) {
+                w.setTicksPerAnimalSpawns(getSettings().getTicksPerAnimalSpawns());
+            }
+            if (getSettings().getTicksPerMonsterSpawns() > 0) {
+                w.setTicksPerMonsterSpawns(getSettings().getTicksPerMonsterSpawns());
+            }
         }
 
     }