diff --git a/CMakeLists.txt b/CMakeLists.txt
index d5915b6..9bbe031 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,28 +4,30 @@
 cmake_minimum_required(VERSION 3.5)
 project(pocket C)
 
-set(POCKET_SRC_DIRS 
-    ${CMAKE_CURRENT_SOURCE_DIR}/src/core
-    ${CMAKE_CURRENT_SOURCE_DIR}/src/libs
+set(POCKET_SRC_DIRS
+        ${CMAKE_CURRENT_SOURCE_DIR}/src/core
+        ${CMAKE_CURRENT_SOURCE_DIR}/src/libs
 )
 
+add_compile_definitions(PK_DLL)
+
 file(GLOB POCKET_SOURCES "")
-foreach(POCKET_SRC_DIR ${POCKET_SRC_DIRS})
+foreach (POCKET_SRC_DIR ${POCKET_SRC_DIRS})
     file(GLOB SOURCES "${POCKET_SRC_DIR}/*.c")
     list(APPEND POCKET_SOURCES ${SOURCES})
-endforeach()
+endforeach ()
 
 add_library(${PROJECT_NAME} ${POCKET_SOURCES})
 target_include_directories(${PROJECT_NAME} PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}/src/include)
-if(NOT MSVC)
+        ${CMAKE_CURRENT_SOURCE_DIR}/src/include)
+target_compile_definitions(${PROJECT_NAME} PRIVATE PK_COMPILE)
+if (NOT MSVC)
     target_link_libraries(${PROJECT_NAME} m dl)
     target_compile_options(${PROJECT_NAME} PRIVATE -fPIC)
-endif()
+endif ()
 
 # if pocket is top level proejct build cli
-if(${PROJECT_NAME} STREQUAL ${CMAKE_PROJECT_NAME})
+if (${PROJECT_NAME} STREQUAL ${CMAKE_PROJECT_NAME})
     add_executable(${PROJECT_NAME}cli ${CMAKE_SOURCE_DIR}/cli/main.c)
     target_link_libraries(${PROJECT_NAME}cli ${PROJECT_NAME})
-endif()
-
+endif ()