diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2cffd3d..0749c57 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,7 @@ target_include_directories(calculator_lib
 # 🔥 aquí está la magia
 target_link_libraries(calculator_lib
     PUBLIC arena
+    PUBLIC arraylist
 )
 
 add_executable(calculator src/main.c)
diff --git a/include/lexer.h b/include/lexer.h
index 9ca60c0..f4b7d81 100644
--- a/include/lexer.h
+++ b/include/lexer.h
@@ -1,6 +1,7 @@
 #ifndef LEXER_H
 #define LEXER_H
 
+#include "arraylist.h"
 #include <stddef.h>
 #include <stdbool.h>
 #include <stdint.h>
diff --git a/src/lexer.c b/src/lexer.c
index 7febdfc..4567c7b 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -1,6 +1,5 @@
 #include "lexer.h"
 #include <ctype.h>
-#include <math.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <strings.h>