diff --git a/src/build/core/AddVariable.go b/src/build/core/AddVariable.go
index 522f1df..8b36a56 100644
--- a/src/build/core/AddVariable.go
+++ b/src/build/core/AddVariable.go
@@ -11,8 +11,13 @@ func (f *Function) AddVariable(variable *scope.Variable) {
 		f.Comment("%s = %s (%d uses)", variable.Name, variable.Register, variable.Alive)
 	}
 
-	scope := f.CurrentScope()
-	variable.Scope = scope
-	scope.Variables[variable.Name] = variable
-	scope.Use(variable.Register)
+	s := f.CurrentScope()
+	variable.Scope = s
+
+	if s.Variables == nil {
+		s.Variables = map[string]*scope.Variable{}
+	}
+
+	s.Variables[variable.Name] = variable
+	s.Use(variable.Register)
 }
diff --git a/src/build/core/NewFunction.go b/src/build/core/NewFunction.go
index 2dc683d..8ad25ba 100644
--- a/src/build/core/NewFunction.go
+++ b/src/build/core/NewFunction.go
@@ -16,12 +16,10 @@ func NewFunction(name string, file *fs.File, body []token.Token) *Function {
 		File: file,
 		Body: body,
 		Assembler: asm.Assembler{
-			Instructions: make([]asm.Instruction, 0, 32),
+			Instructions: make([]asm.Instruction, 0, 8),
 		},
 		Stack: scope.Stack{
-			Scopes: []*scope.Scope{
-				{Variables: map[string]*scope.Variable{}},
-			},
+			Scopes: []*scope.Scope{{}},
 		},
 		cpu: cpu.CPU{
 			All:     x64.AllRegisters,