diff --git a/src/Stmt.cc b/src/Stmt.cc
index 453e72cc12..a1edb51ee0 100644
--- a/src/Stmt.cc
+++ b/src/Stmt.cc
@@ -39,8 +39,6 @@ const char* stmt_name(StmtTag t) {
         "next",
         "break",
         "return",
-        "add",
-        "delete",
         "list",
         "bodylist",
         "<init>",
@@ -904,49 +902,6 @@ TraversalCode SwitchStmt::Traverse(TraversalCallback* cb) const {
     HANDLE_TC_STMT_POST(tc);
 }
 
-AddDelStmt::AddDelStmt(StmtTag t, ExprPtr arg_e) : ExprStmt(t, std::move(arg_e)) {}
-
-bool AddDelStmt::IsPure() const { return false; }
-
-TraversalCode AddDelStmt::Traverse(TraversalCallback* cb) const {
-    TraversalCode tc = cb->PreStmt(this);
-    HANDLE_TC_STMT_PRE(tc);
-
-    // Argument is stored in base class's "e" field.
-    tc = e->Traverse(cb);
-    HANDLE_TC_STMT_PRE(tc);
-
-    tc = cb->PostStmt(this);
-    HANDLE_TC_STMT_POST(tc);
-}
-
-AddStmt::AddStmt(ExprPtr arg_e) : AddDelStmt(STMT_ADD, std::move(arg_e)) {
-    if ( ! e->CanAdd() )
-        Error("illegal add statement");
-}
-
-ValPtr AddStmt::Exec(Frame* f, StmtFlowType& flow) {
-    RegisterAccess();
-    flow = FLOW_NEXT;
-    e->Add(f);
-    return nullptr;
-}
-
-DelStmt::DelStmt(ExprPtr arg_e) : AddDelStmt(STMT_DELETE, std::move(arg_e)) {
-    if ( e->IsError() )
-        return;
-
-    if ( ! e->CanDel() )
-        Error("illegal delete statement");
-}
-
-ValPtr DelStmt::Exec(Frame* f, StmtFlowType& flow) {
-    RegisterAccess();
-    flow = FLOW_NEXT;
-    e->Delete(f);
-    return nullptr;
-}
-
 EventStmt::EventStmt(EventExprPtr arg_e) : ExprStmt(STMT_EVENT, arg_e), event_expr(std::move(arg_e)) {}
 
 ValPtr EventStmt::Exec(Frame* f, StmtFlowType& flow) {
diff --git a/src/Stmt.h b/src/Stmt.h
index 5e575f0555..d714a61d56 100644
--- a/src/Stmt.h
+++ b/src/Stmt.h
@@ -228,42 +228,6 @@ protected:
     std::vector<std::pair<ID*, int>> case_label_type_list;
 };
 
-// Helper class. Added for script optimization, but it makes sense
-// in terms of factoring even without.
-class AddDelStmt : public ExprStmt {
-public:
-    TraversalCode Traverse(TraversalCallback* cb) const override;
-
-    bool IsPure() const override;
-
-    // Optimization-related:
-    StmtPtr DoReduce(Reducer* c) override;
-    bool IsReduced(Reducer* c) const override;
-
-protected:
-    AddDelStmt(StmtTag t, ExprPtr arg_e);
-};
-
-class AddStmt final : public AddDelStmt {
-public:
-    explicit AddStmt(ExprPtr e);
-
-    ValPtr Exec(Frame* f, StmtFlowType& flow) override;
-
-    // Optimization-related:
-    StmtPtr Duplicate() override;
-};
-
-class DelStmt final : public AddDelStmt {
-public:
-    explicit DelStmt(ExprPtr e);
-
-    ValPtr Exec(Frame* f, StmtFlowType& flow) override;
-
-    // Optimization-related:
-    StmtPtr Duplicate() override;
-};
-
 class EventStmt final : public ExprStmt {
 public:
     explicit EventStmt(EventExprPtr e);
diff --git a/src/StmtEnums.h b/src/StmtEnums.h
index db5ab12aa2..04bbfcb189 100644
--- a/src/StmtEnums.h
+++ b/src/StmtEnums.h
@@ -18,8 +18,6 @@ enum StmtTag {
     STMT_NEXT,
     STMT_BREAK,
     STMT_RETURN,
-    STMT_ADD,
-    STMT_DELETE,
     STMT_LIST,
     STMT_EVENT_BODY_LIST,
     STMT_INIT,