diff --git a/asm/src/main/java/dev/openrs2/asm/InsnListUtils.java b/asm/src/main/java/dev/openrs2/asm/InsnListUtils.java
deleted file mode 100644
index 379c2251..00000000
--- a/asm/src/main/java/dev/openrs2/asm/InsnListUtils.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package dev.openrs2.asm;
-
-import java.util.ArrayList;
-
-import org.objectweb.asm.tree.AbstractInsnNode;
-import org.objectweb.asm.tree.InsnList;
-
-public final class InsnListUtils {
-	public static boolean replaceSimpleExpression(InsnList list, AbstractInsnNode last, AbstractInsnNode replacement) {
-		var deadInsns = new ArrayList<AbstractInsnNode>();
-
-		var height = 0;
-		var insn = last;
-		do {
-			var metadata = StackMetadataKt.stackMetadata(insn);
-			if (insn != last) {
-				deadInsns.add(insn);
-				height -= metadata.getPushes();
-			}
-			height += metadata.getPops();
-
-			if (height == 0) {
-				deadInsns.forEach(list::remove);
-
-				if (replacement != null) {
-					list.set(last, replacement);
-				} else {
-					list.remove(last);
-				}
-
-				return true;
-			}
-
-			insn = insn.getPrevious();
-		} while (insn != null && insn.getType() != AbstractInsnNode.LABEL && InsnNodeUtilsKt.getPure(insn));
-
-		return false;
-	}
-
-	public static boolean deleteSimpleExpression(InsnList list, AbstractInsnNode last) {
-		return replaceSimpleExpression(list, last, null);
-	}
-
-	private InsnListUtils() {
-		/* empty */
-	}
-}
diff --git a/asm/src/main/java/dev/openrs2/asm/InsnListUtils.kt b/asm/src/main/java/dev/openrs2/asm/InsnListUtils.kt
new file mode 100644
index 00000000..5de83018
--- /dev/null
+++ b/asm/src/main/java/dev/openrs2/asm/InsnListUtils.kt
@@ -0,0 +1,39 @@
+package dev.openrs2.asm
+
+import org.objectweb.asm.tree.AbstractInsnNode
+import org.objectweb.asm.tree.InsnList
+
+fun InsnList.replaceSimpleExpression(last: AbstractInsnNode, replacement: AbstractInsnNode?): Boolean {
+    val deadInsns = mutableListOf<AbstractInsnNode>()
+
+    var height = 0
+    var insn: AbstractInsnNode? = last
+    do {
+        val (pops, pushes) = insn!!.stackMetadata()
+        if (insn !== last) {
+            deadInsns.add(insn)
+            height -= pushes
+        }
+        height += pops
+
+        if (height == 0) {
+            deadInsns.forEach(this::remove)
+
+            if (replacement != null) {
+                this[last] = replacement
+            } else {
+                remove(last)
+            }
+
+            return true
+        }
+
+        insn = insn.previous
+    } while (insn != null && insn.type != AbstractInsnNode.LABEL && insn.pure)
+
+    return false
+}
+
+fun InsnList.deleteSimpleExpression(last: AbstractInsnNode): Boolean {
+    return replaceSimpleExpression(last, null)
+}
diff --git a/deob/src/main/java/dev/openrs2/deob/transform/DummyArgTransformer.java b/deob/src/main/java/dev/openrs2/deob/transform/DummyArgTransformer.java
index d45932ff..06cafec5 100644
--- a/deob/src/main/java/dev/openrs2/deob/transform/DummyArgTransformer.java
+++ b/deob/src/main/java/dev/openrs2/deob/transform/DummyArgTransformer.java
@@ -11,7 +11,7 @@ import com.google.common.base.Preconditions;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Multimap;
-import dev.openrs2.asm.InsnListUtils;
+import dev.openrs2.asm.InsnListUtilsKt;
 import dev.openrs2.asm.InsnMatcher;
 import dev.openrs2.asm.InsnNodeUtilsKt;
 import dev.openrs2.asm.MemberRef;
@@ -414,14 +414,14 @@ public final class DummyArgTransformer extends Transformer {
 		}
 
 		for (var insn : alwaysTakenBranches) {
-			if (InsnListUtils.replaceSimpleExpression(method.instructions, insn, new JumpInsnNode(Opcodes.GOTO, insn.label))) {
+			if (InsnListUtilsKt.replaceSimpleExpression(method.instructions, insn, new JumpInsnNode(Opcodes.GOTO, insn.label))) {
 				branchesSimplified++;
 				changed = true;
 			}
 		}
 
 		for (var insn : neverTakenBranches) {
-			if (InsnListUtils.deleteSimpleExpression(method.instructions, insn)) {
+			if (InsnListUtilsKt.deleteSimpleExpression(method.instructions, insn)) {
 				branchesSimplified++;
 				changed = true;
 			}
@@ -434,7 +434,7 @@ public final class DummyArgTransformer extends Transformer {
 			}
 
 			var replacement = InsnNodeUtilsKt.createIntConstant(entry.getValue());
-			if (InsnListUtils.replaceSimpleExpression(method.instructions, insn, replacement)) {
+			if (InsnListUtilsKt.replaceSimpleExpression(method.instructions, insn, replacement)) {
 				constantsInlined++;
 				changed = true;
 			}
diff --git a/deob/src/main/java/dev/openrs2/deob/transform/DummyLocalTransformer.java b/deob/src/main/java/dev/openrs2/deob/transform/DummyLocalTransformer.java
index 1513c94a..dcc3b8d3 100644
--- a/deob/src/main/java/dev/openrs2/deob/transform/DummyLocalTransformer.java
+++ b/deob/src/main/java/dev/openrs2/deob/transform/DummyLocalTransformer.java
@@ -1,6 +1,6 @@
 package dev.openrs2.deob.transform;
 
-import dev.openrs2.asm.InsnListUtils;
+import dev.openrs2.asm.InsnListUtilsKt;
 import dev.openrs2.asm.classpath.ClassPath;
 import dev.openrs2.asm.classpath.Library;
 import dev.openrs2.asm.transform.Transformer;
@@ -56,7 +56,7 @@ public final class DummyLocalTransformer extends Transformer {
 				continue;
 			}
 
-			if (InsnListUtils.deleteSimpleExpression(method.instructions, insn)) {
+			if (InsnListUtilsKt.deleteSimpleExpression(method.instructions, insn)) {
 				localsRemoved++;
 			}
 		}