diff --git a/peglib.h b/peglib.h
index 7b30f3d..47dd3da 100644
--- a/peglib.h
+++ b/peglib.h
@@ -768,9 +768,11 @@ public:
 
   std::vector<bool> cut_stack;
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
   std::vector<std::map<std::string, std::unordered_set<std::string>>>
       symbol_tables_stack;
   size_t symbol_tables_stack_size = 0;
+#endif
 
   const size_t def_count;
   const bool enablePackratParsing;
@@ -802,7 +804,9 @@ public:
     push_args({});
     push_capture_scope();
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
     push_symbol_tables();
+#endif
   }
 
   ~Context() {
@@ -812,8 +816,10 @@ public:
     assert(!capture_scope_stack_size);
     assert(cut_stack.empty());
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
     pop_symbol_tables();
     assert(!symbol_tables_stack_size);
+#endif
   }
 
   Context(const Context &) = delete;
@@ -854,14 +860,18 @@ public:
 
   SemanticValues &push() {
     push_capture_scope();
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
     push_symbol_tables();
+#endif
     return push_semantic_values_scope();
   }
 
   void pop() {
     pop_capture_scope();
     pop_semantic_values_scope();
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
     pop_symbol_tables();
+#endif
   }
 
   // Semantic values
@@ -924,6 +934,7 @@ public:
     }
   }
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
   // Symbol tables
   void push_symbol_tables() {
     assert(symbol_tables_stack_size <= symbol_tables_stack.size());
@@ -968,6 +979,7 @@ public:
     }
     return false;
   }
+#endif
 
   // Error
   void set_error_pos(const char *a_s, const char *literal = nullptr);
@@ -1060,7 +1072,9 @@ public:
         vs.choice_count_ = opes_.size();
         vs.choice_ = id;
         c.shift_capture_values();
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
         c.shift_symbol_tables();
+#endif
         break;
       } else if (!c.cut_stack.empty() && c.cut_stack.back()) {
         break;
@@ -1100,7 +1114,9 @@ public:
       if (success(len)) {
         vs.append(chvs);
         c.shift_capture_values();
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
         c.shift_symbol_tables();
+#endif
       } else {
         return len;
       }
@@ -1117,7 +1133,9 @@ public:
       if (success(len)) {
         vs.append(chvs);
         c.shift_capture_values();
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
         c.shift_symbol_tables();
+#endif
       } else {
         break;
       }
@@ -2398,9 +2416,11 @@ public:
 
   bool eoi_check = true;
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
   bool declare_symbol = false;
   bool check_symbol = false;
   std::string symbol_table_name;
+#endif
 
 private:
   friend class Reference;
@@ -2775,6 +2795,7 @@ inline size_t Holder::parse_core(const char *s, size_t n, SemanticValues &vs,
           c.error_info.message = msg;
         }
         len = static_cast<size_t>(-1);
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
       } else if (outer_->declare_symbol) {
         assert(outer_->is_token());
         auto symbol = chvs.token_to_string();
@@ -2791,6 +2812,7 @@ inline size_t Holder::parse_core(const char *s, size_t n, SemanticValues &vs,
           msg = "'" + symbol + "' doesn't exist.";
           len = static_cast<size_t>(-1);
         }
+#endif
       }
 
       if (success(len)) {
@@ -3443,8 +3465,10 @@ private:
             g["EndBlacket"]);
     g["InstructionItem"] <= cho(g["PrecedenceClimbing"], g["ErrorMessage"],
                                 g["NoAstOpt"]
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
                                 ,
                                 g["DeclareSymbol"], g["CheckSymbol"]
+#endif
                             );
     ~g["InstructionItemSeparator"] <= seq(chr(';'), g["Spacing"]);
 
@@ -3478,11 +3502,13 @@ private:
     // No Ast node optimazation instruction
     g["NoAstOpt"] <= seq(lit("no_ast_opt"), g["SpacesZom"]);
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
     // Symbol table instruction
     g["DeclareSymbol"] <= seq(lit("declare_symbol"), g["SpacesZom"],
                               g["Identifier"], g["SpacesZom"]);
     g["CheckSymbol"] <= seq(lit("check_symbol"), g["SpacesZom"],
                             g["Identifier"], g["SpacesZom"]);
+#endif
 
     // Set definition names
     for (auto &x : g) {
@@ -3886,6 +3912,7 @@ private:
       return instruction;
     };
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
     g["DeclareSymbol"] = [](const SemanticValues &vs) {
       Instruction instruction;
       instruction.type = "declare_symbol";
@@ -3901,6 +3928,7 @@ private:
       instruction.sv = vs.sv();
       return instruction;
     };
+#endif
 
     g["Instruction"] = [](const SemanticValues &vs) {
       return vs.transform<Instruction>();
@@ -4152,12 +4180,14 @@ private:
           rule.error_message = std::any_cast<std::string>(instruction.data);
         } else if (instruction.type == "no_ast_opt") {
           rule.no_ast_opt = true;
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
         } else if (instruction.type == "declare_symbol") {
           rule.declare_symbol = true;
           rule.symbol_table_name = std::any_cast<std::string>(instruction.data);
         } else if (instruction.type == "check_symbol") {
           rule.check_symbol = true;
           rule.symbol_table_name = std::any_cast<std::string>(instruction.data);
+#endif
         }
       }
     }
diff --git a/test/test2.cc b/test/test2.cc
index 7d4a6a7..52c76bb 100644
--- a/test/test2.cc
+++ b/test/test2.cc
@@ -861,6 +861,7 @@ TEST(PredicateTest, Semantic_predicate_test) {
   EXPECT_FALSE(parser.parse("200", val));
 }
 
+#ifdef CPPPEGLIB_SYMBOL_TABLE_SUPPORT
 TEST(SymbolTableTest, symbol_instruction_test) {
   parser parser(R"(S            <- (Decl / Ref)*
 Decl         <- 'decl' symbol
@@ -1054,6 +1055,7 @@ decl aaa
     EXPECT_FALSE(parser.parse(source, ast));
   }
 }
+#endif
 
 TEST(UnicodeTest, Japanese_character) {
   peg::parser parser(u8R"(