diff --git a/cache/src/main/antlr4/net/runelite/cache/script/assembler/rs2asm.g4 b/cache/src/main/antlr4/net/runelite/cache/script/assembler/rs2asm.g4
index 7d0717dbcd..ce445596a6 100644
--- a/cache/src/main/antlr4/net/runelite/cache/script/assembler/rs2asm.g4
+++ b/cache/src/main/antlr4/net/runelite/cache/script/assembler/rs2asm.g4
@@ -26,13 +26,15 @@ grammar rs2asm;
 
 prog: (header NEWLINE)* (line NEWLINE)+ ;
 
-header: int_stack_count | string_stack_count | int_var_count | string_var_count ;
+header: id | int_stack_count | string_stack_count | int_var_count | string_var_count ;
 
+id: '.id ' id_value ;
 int_stack_count: '.int_stack_count ' int_stack_value ;
 string_stack_count: '.string_stack_count ' string_stack_value ;
 int_var_count: '.int_var_count ' int_var_value ;
 string_var_count: '.string_var_count ' string_var_value ;
 
+id_value: INT ;
 int_stack_value: INT ;
 string_stack_value: INT ;
 int_var_value: INT ;
diff --git a/cache/src/main/java/net/runelite/cache/script/assembler/ScriptWriter.java b/cache/src/main/java/net/runelite/cache/script/assembler/ScriptWriter.java
index 39e314d499..4201619e05 100644
--- a/cache/src/main/java/net/runelite/cache/script/assembler/ScriptWriter.java
+++ b/cache/src/main/java/net/runelite/cache/script/assembler/ScriptWriter.java
@@ -42,6 +42,7 @@ public class ScriptWriter extends rs2asmBaseListener
 	private final Instructions instructions;
 	private final LabelVisitor labelVisitor;
 
+	private int id;
 	private int pos;
 	private int intStackCount;
 	private int stringStackCount;
@@ -58,6 +59,13 @@ public class ScriptWriter extends rs2asmBaseListener
 		this.labelVisitor = labelVisitor;
 	}
 
+	@Override
+	public void enterId_value(rs2asmParser.Id_valueContext ctx)
+	{
+		int value = Integer.parseInt(ctx.getText());
+		id = value;
+	}
+
 	@Override
 	public void enterInt_stack_value(rs2asmParser.Int_stack_valueContext ctx)
 	{
@@ -209,6 +217,7 @@ public class ScriptWriter extends rs2asmBaseListener
 	public ScriptDefinition buildScript()
 	{
 		ScriptDefinition script = new ScriptDefinition();
+		script.setId(id);
 		script.setIntStackCount(intStackCount);
 		script.setStringStackCount(stringStackCount);
 		script.setLocalIntCount(localIntCount);