diff --git a/env_support/cmake/custom.cmake b/env_support/cmake/custom.cmake
index 76bd9ac17b..f8dd3ede9d 100644
--- a/env_support/cmake/custom.cmake
+++ b/env_support/cmake/custom.cmake
@@ -109,7 +109,7 @@ include(${CMAKE_CURRENT_BINARY_DIR}/lv_conf.cmake)
 # Add definition of LV_CONF_PATH only if needed
 # Do not redefine it if already defined in tests/CMakeLists.txt
 if(LV_CONF_PATH AND NOT LV_BUILD_TEST)
-  target_compile_definitions(lvgl PUBLIC LV_CONF_PATH=${LV_CONF_PATH})
+  target_compile_definitions(lvgl PUBLIC LV_CONF_PATH="${LV_CONF_PATH}")
 endif()
 
 # Add definition of LV_CONF_SKIP only if needed