diff --git a/BlueMapCore/src/main/java/de/bluecolored/bluemap/core/mca/LegacyBiomes.java b/BlueMapCore/src/main/java/de/bluecolored/bluemap/core/mca/LegacyBiomes.java
index 902a8562..35330aa5 100644
--- a/BlueMapCore/src/main/java/de/bluecolored/bluemap/core/mca/LegacyBiomes.java
+++ b/BlueMapCore/src/main/java/de/bluecolored/bluemap/core/mca/LegacyBiomes.java
@@ -109,7 +109,7 @@ public class LegacyBiomes {
     }
 
     public static String idFor(int legacyId) {
-        if (legacyId < 0 || legacyId > BIOME_IDS.length) legacyId = 0;
+        if (legacyId < 0 || legacyId >= BIOME_IDS.length) legacyId = 0;
         return BIOME_IDS[legacyId];
     }