diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f5aa5c..5713703 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,9 +26,9 @@ endif()
 project(rts)
 
 add_executable(${PROJECT_NAME} "src/main.c")
+set(cdroot ${CMAKE_BINARY_DIR}/cdimg)
 
 if(PS1_BUILD)
-    set(cdroot ${CMAKE_SOURCE_DIR}/cdimg)
     file(MAKE_DIRECTORY ${cdroot})
     target_link_directories(${PROJECT_NAME} PUBLIC $ENV{PSXSDK_PATH}/lib)
     target_link_libraries(${PROJECT_NAME} PUBLIC -lpsx -lfixmath)
@@ -53,7 +53,6 @@ if(PS1_BUILD)
             "STACK = 801FF800\n")
     endif()
 elseif(WIN9X_BUILD)
-    set(cdroot ${CMAKE_BINARY_DIR}/cdimg)
     file(MAKE_DIRECTORY ${cdroot})
     if("$ENV{SDL_PATH}" STREQUAL "")
         message(FATAL_ERROR "please define env variable SDL_PATH")
@@ -76,7 +75,6 @@ elseif(WIN9X_BUILD)
     link_libraries(gdi32 user32 winmm dxguid freetype)
     set(SDL1_2_BUILD 1)
 elseif(HOST_BUILD)
-    set(cdroot ${CMAKE_BINARY_DIR}/cdimg)
     file(MAKE_DIRECTORY ${cdroot})
     find_package(SDL 1.2 REQUIRED)
     find_package(SDL_mixer 1.2 REQUIRED)