diff --git a/src/main/java/com/garbagemule/MobArena/MAUtils.java b/src/main/java/com/garbagemule/MobArena/MAUtils.java
index 771a393..3a0afc9 100644
--- a/src/main/java/com/garbagemule/MobArena/MAUtils.java
+++ b/src/main/java/com/garbagemule/MobArena/MAUtils.java
@@ -5,6 +5,7 @@ import com.garbagemule.MobArena.framework.ArenaMaster;
 import com.garbagemule.MobArena.region.ArenaRegion;
 import com.garbagemule.MobArena.things.InvalidThingInputString;
 import com.garbagemule.MobArena.things.ThingPicker;
+import com.garbagemule.MobArena.util.Materials;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.World;
@@ -274,7 +275,7 @@ public class MAUtils
         // Place the hippie signs
         //Iterator<String> iterator = am.getClasses().iterator();
         Iterator<ArenaClass> iterator = am.getClasses().values().iterator();
-        Rotatable signData = (Rotatable) Material.OAK_SIGN.createBlockData();
+        Rotatable signData = (Rotatable) Materials.SIGN.createBlockData();
         signData.setRotation(BlockFace.NORTH);
         for (int i = lx1+2; i <= lx2-2; i++) // Signs
         {
diff --git a/src/main/java/com/garbagemule/MobArena/util/Materials.java b/src/main/java/com/garbagemule/MobArena/util/Materials.java
new file mode 100644
index 0000000..801c658
--- /dev/null
+++ b/src/main/java/com/garbagemule/MobArena/util/Materials.java
@@ -0,0 +1,22 @@
+package com.garbagemule.MobArena.util;
+
+import org.bukkit.Material;
+
+import java.util.Arrays;
+
+public class Materials {
+
+    public static final Material SIGN = resolve("OAK_SIGN", "SIGN");
+
+    private static Material resolve(String... names) {
+        for (String name : names) {
+            try {
+                return Material.valueOf(name);
+            } catch (IllegalArgumentException e) {
+                // Swallow
+            }
+        }
+        throw new IllegalStateException("Unknown material: " + Arrays.toString(names));
+    }
+
+}