diff --git a/include/lexer.h b/include/lexer.h
index 61c5f10..15c208f 100644
--- a/include/lexer.h
+++ b/include/lexer.h
@@ -58,6 +58,7 @@ enum libab_lexer_token_e {
     TOKEN_OP_INFIX,
     TOKEN_OP_PREFIX,
     TOKEN_OP_POSTFIX,
+    TOKEN_OP_RESERVED,
     TOKEN_KW_IF,
     TOKEN_KW_ELSE,
     TOKEN_KW_WHILE,
diff --git a/include/reserved.h b/include/reserved.h
index f4f93e7..7e4bab8 100644
--- a/include/reserved.h
+++ b/include/reserved.h
@@ -37,5 +37,17 @@ typedef struct libab_reserved_operator_s libab_reserved_operator;
  * @return the reserved operator, if it is found.
  */
 const libab_reserved_operator* libab_find_reserved_operator(const char* name);
+/**
+ * Registers the existing reserved operators into the given lexer.
+ * @param lexer the lexer to register into.
+ * @return the result of the registration.
+ */
+libab_result libab_register_reserved_operators(libab_lexer* lexer);
+/**
+ * Remove the existing reserved operators from the given lexer.
+ * @param lexer the lexer to remove from.
+ * @return the result of the removal.
+ */
+libab_result libab_remove_reserved_operators(libab_lexer* lexer);
 
 #endif
diff --git a/src/lexer.c b/src/lexer.c
index 48e9252..9b3fa48 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -43,6 +43,10 @@ libab_result libab_lexer_init(libab_lexer* lexer) {
                 eval_config_add(&lexer->config, words[i], tokens[i]));
     }
 
+    if(result != LIBAB_SUCCESS) {
+        eval_config_free(&lexer->config);
+    }
+
     return result;
 }
 
diff --git a/src/libabacus.c b/src/libabacus.c
index 837adbb..5446da5 100644
--- a/src/libabacus.c
+++ b/src/libabacus.c
@@ -1,11 +1,25 @@
 #include "libabacus.h"
 #include <stdlib.h>
 #include "util.h"
+#include "reserved.h"
 
 libab_result libab_init(libab* ab) {
+    libab_result result;
     libab_table_init(&ab->table);
     libab_parser_init(&ab->parser, &ab->table);
-    return libab_lexer_init(&ab->lexer);
+    result = libab_lexer_init(&ab->lexer);
+
+    if(result == LIBAB_SUCCESS) {
+        result = libab_register_reserved_operators(&ab->lexer);
+    }
+
+    if(result != LIBAB_SUCCESS) {
+        libab_table_free(&ab->table);
+        libab_parser_free(&ab->parser);
+        libab_lexer_free(&ab->lexer);
+    }
+
+    return result;
 }
 
 void _sanitize(char* to, const char* from, size_t buffer_size) {
diff --git a/src/reserved.c b/src/reserved.c
index c14f9ba..2283272 100644
--- a/src/reserved.c
+++ b/src/reserved.c
@@ -1,5 +1,6 @@
 #include "reserved.h"
 #include "string.h"
+#include "util.h"
 
 static const libab_reserved_operator libab_reserved_operators[] = {
     {
@@ -8,10 +9,10 @@ static const libab_reserved_operator libab_reserved_operators[] = {
         1 /* Right associative, a = b = 6 should be a = (b = 6) */
     }
 };
+static const size_t element_count = 
+    sizeof(libab_reserved_operators) / sizeof(libab_reserved_operator);
 
 const libab_reserved_operator* libab_find_reserved_operator(const char* name) {
-    static const size_t element_count = 
-        sizeof(libab_reserved_operators) / sizeof(libab_reserved_operator);
     size_t i;
     for(i = 0; i < element_count; i++) {
         if(strcmp(name, libab_reserved_operators[i].op) == 0)
@@ -19,3 +20,23 @@ const libab_reserved_operator* libab_find_reserved_operator(const char* name) {
     }
     return NULL;
 }
+
+libab_result libab_register_reserved_operators(libab_lexer* lexer) {
+    libab_result result = LIBAB_SUCCESS;
+    size_t i;
+    for(i = 0; i < element_count && result == LIBAB_SUCCESS; i++) {
+        result = libab_convert_lex_result(eval_config_add(&lexer->config,
+                    libab_reserved_operators[i].op, TOKEN_OP_RESERVED));
+    }
+    return result;
+}
+
+libab_result libab_remove_reserved_operators(libab_lexer* lexer) {
+    libab_result result = LIBAB_SUCCESS;
+    size_t i;
+    for(i = 0; i < element_count && result == LIBAB_SUCCESS; i++) {
+        result = libab_convert_lex_result(eval_config_remove(&lexer->config,
+                    libab_reserved_operators[i].op, TOKEN_OP_RESERVED));
+    }
+    return result;
+}