diff --git a/spec/fixtures/parsers/arithmetic.c b/spec/fixtures/parsers/arithmetic.c
index 45106297..0bf94c37 100644
--- a/spec/fixtures/parsers/arithmetic.c
+++ b/spec/fixtures/parsers/arithmetic.c
@@ -32,8 +32,8 @@ static const char *ts_symbol_names[] = {
     [sym_quotient] = "quotient",
     [sym_exponent] = "exponent",
     [sym_group] = "group",
-    [ts_builtin_sym_error] = "error",
-    [ts_builtin_sym_end] = "end",
+    [ts_builtin_sym_error] = "ERROR",
+    [ts_builtin_sym_end] = "END",
     [sym_number] = "number",
     [sym_variable] = "variable",
     [sym_comment] = "comment",
diff --git a/spec/fixtures/parsers/golang.c b/spec/fixtures/parsers/golang.c
index a208633b..d12908f0 100644
--- a/spec/fixtures/parsers/golang.c
+++ b/spec/fixtures/parsers/golang.c
@@ -120,8 +120,8 @@ static const char *ts_symbol_names[] = {
     [sym_package_name] = "package_name",
     [sym_var_name] = "var_name",
     [sym_type_name] = "type_name",
-    [ts_builtin_sym_error] = "error",
-    [ts_builtin_sym_end] = "end",
+    [ts_builtin_sym_error] = "ERROR",
+    [ts_builtin_sym_end] = "END",
     [sym__line_break] = "_line_break",
     [sym_string] = "string",
     [sym__identifier] = "_identifier",
diff --git a/spec/fixtures/parsers/javascript.c b/spec/fixtures/parsers/javascript.c
index 18859758..ad6bd7c1 100644
--- a/spec/fixtures/parsers/javascript.c
+++ b/spec/fixtures/parsers/javascript.c
@@ -151,8 +151,8 @@ static const char *ts_symbol_names[] = {
     [sym_formal_parameters] = "formal_parameters",
     [sym_arguments] = "arguments",
     [sym_pair] = "pair",
-    [ts_builtin_sym_error] = "error",
-    [ts_builtin_sym_end] = "end",
+    [ts_builtin_sym_error] = "ERROR",
+    [ts_builtin_sym_end] = "END",
     [sym_comment] = "comment",
     [sym_string] = "string",
     [sym_regex] = "regex",
diff --git a/spec/fixtures/parsers/json.c b/spec/fixtures/parsers/json.c
index 63eef732..8dced741 100644
--- a/spec/fixtures/parsers/json.c
+++ b/spec/fixtures/parsers/json.c
@@ -27,8 +27,8 @@ static const char *ts_symbol_names[] = {
     [sym_value] = "value",
     [sym_object] = "object",
     [sym_array] = "array",
-    [ts_builtin_sym_error] = "error",
-    [ts_builtin_sym_end] = "end",
+    [ts_builtin_sym_error] = "ERROR",
+    [ts_builtin_sym_end] = "END",
     [sym_string] = "string",
     [sym_number] = "number",
     [sym_null] = "null",
diff --git a/src/compiler/generate_code/c_code.cc b/src/compiler/generate_code/c_code.cc
index f806df8f..32c4f68f 100644
--- a/src/compiler/generate_code/c_code.cc
+++ b/src/compiler/generate_code/c_code.cc
@@ -328,9 +328,9 @@ class CCodeGenerator {
   string symbol_name(const rules::Symbol &symbol) {
     if (symbol.is_built_in()) {
       if (symbol == rules::ERROR())
-        return "error";
+        return "ERROR";
       else if (symbol == rules::END_OF_INPUT())
-        return "end";
+        return "END";
       else
         return "DOCUMENT";
     } else {