diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28b0c84f..63f1ace6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -394,12 +394,11 @@ endif()
 
 # Installation paths defined before compiling sources
 if(PORTABLE OR (PLATFORM_WINDOWS AND MXE))
-    # We need to use STRING because PATH doesn't accept relative paths
-    set(COLOBOT_INSTALL_BIN_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE STRING "Colobot binary directory")
-    set(COLOBOT_INSTALL_LIB_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE STRING "Colobot libraries directory")
-    set(COLOBOT_INSTALL_DATA_DIR ${CMAKE_INSTALL_PREFIX}/data CACHE STRING "Colobot shared data directory")
-    set(COLOBOT_INSTALL_I18N_DIR ${CMAKE_INSTALL_PREFIX}/lang CACHE STRING "Colobot translations directory")
-    set(COLOBOT_INSTALL_DOC_DIR ${CMAKE_INSTALL_PREFIX}/doc CACHE STRING "Colobot documentation directory")
+    set(COLOBOT_INSTALL_BIN_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE PATH "Colobot binary directory")
+    set(COLOBOT_INSTALL_LIB_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE PATH "Colobot libraries directory")
+    set(COLOBOT_INSTALL_DATA_DIR ${CMAKE_INSTALL_PREFIX}/data CACHE PATH "Colobot shared data directory")
+    set(COLOBOT_INSTALL_I18N_DIR ${CMAKE_INSTALL_PREFIX}/lang CACHE PATH "Colobot translations directory")
+    set(COLOBOT_INSTALL_DOC_DIR ${CMAKE_INSTALL_PREFIX}/doc CACHE PATH "Colobot documentation directory")
     set(USE_RELATIVE_PATHS ON)
 elseif(PLATFORM_WINDOWS)
     set(COLOBOT_INSTALL_BIN_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE PATH "Colobot binary directory")