diff --git a/src/main/java/com/sk89q/worldedit/expression/Expression.java b/src/main/java/com/sk89q/worldedit/expression/Expression.java
index a6b6e23a7..1b34c2032 100644
--- a/src/main/java/com/sk89q/worldedit/expression/Expression.java
+++ b/src/main/java/com/sk89q/worldedit/expression/Expression.java
@@ -29,6 +29,7 @@ import com.sk89q.worldedit.expression.lexer.tokens.Token;
 import com.sk89q.worldedit.expression.parser.Parser;
 import com.sk89q.worldedit.expression.runtime.Constant;
 import com.sk89q.worldedit.expression.runtime.EvaluationException;
+import com.sk89q.worldedit.expression.runtime.Functions;
 import com.sk89q.worldedit.expression.runtime.RValue;
 import com.sk89q.worldedit.expression.runtime.ReturnException;
 import com.sk89q.worldedit.expression.runtime.Variable;
@@ -63,7 +64,7 @@ public class Expression {
     private final Map<String, RValue> variables = new HashMap<String, RValue>();
     private final String[] variableNames;
     private RValue root;
-    private final Map<Integer, double[]> megabuf = new HashMap<Integer, double[]>();
+    private final Functions functions = new Functions();
 
     public static Expression compile(String expression, String... variableNames) throws ExpressionException {
         return new Expression(expression, variableNames);
@@ -153,7 +154,7 @@ public class Expression {
         }
     }
 
-    public Map<Integer, double[]> getMegabuf() {
-        return megabuf;
+    public Functions getFunctions() {
+        return functions;
     }
 }
diff --git a/src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java b/src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java
index 3d679baab..2817415dc 100644
--- a/src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java
+++ b/src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java
@@ -277,6 +277,7 @@ public final class Functions {
 
 
     private static final Map<Integer, double[]> gmegabuf = new HashMap<Integer, double[]>();
+    private final Map<Integer, double[]> megabuf = new HashMap<Integer, double[]>();
 
     private static double[] getSubBuffer(Map<Integer, double[]> megabuf, Integer key) {
         double[] ret = megabuf.get(key);
@@ -306,18 +307,18 @@ public final class Functions {
 
     @Dynamic
     public static double megabuf(RValue index) throws EvaluationException {
-        return getBufferItem(Expression.getInstance().getMegabuf(), (int) index.getValue());
+        return getBufferItem(Expression.getInstance().getFunctions().megabuf, (int) index.getValue());
     }
 
     @Dynamic
     public static double megabuf(RValue index, double value) throws EvaluationException {
-        return setBufferItem(Expression.getInstance().getMegabuf(), (int) index.getValue(), value);
+        return setBufferItem(Expression.getInstance().getFunctions().megabuf, (int) index.getValue(), value);
     }
 
     @Dynamic
     public static double closest(RValue x, RValue y, RValue z, RValue index, RValue count, RValue stride) throws EvaluationException {
         return findClosest(
-            Expression.getInstance().getMegabuf(),
+            Expression.getInstance().getFunctions().megabuf,
             x.getValue(),
             y.getValue(),
             z.getValue(),