diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index e336232e..46496497 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -19,8 +19,8 @@ if (MSVC)
 endif ()
 
 # Add compiler definitions for the directories
-add_definitions(-DSDRPP_MODULES_LOAD_DIR=${SDRPP_MODULES_LOAD_DIR})
-add_definitions(-DSDRPP_RES_LOAD_DIR=${SDRPP_RES_LOAD_DIR})
+add_definitions(-DSDRPP_MODULES_LOAD_DIR="${SDRPP_MODULES_LOAD_DIR}")
+add_definitions(-DSDRPP_RES_LOAD_DIR="${SDRPP_RES_LOAD_DIR}")
 
 # Configure backend sources
 if (OPT_BACKEND_GLFW)
diff --git a/sdrpp_module.cmake b/sdrpp_module.cmake
index d87f2e88..b7e7e438 100644
--- a/sdrpp_module.cmake
+++ b/sdrpp_module.cmake
@@ -7,8 +7,8 @@ if (NOT SDRPP_MODULE_COMPILER_FLAGS)
 endif ()
 
 # Add compiler definitions for the directories
-add_definitions(-DSDRPP_MODULES_LOAD_DIR=${SDRPP_MODULES_LOAD_DIR})
-add_definitions(-DSDRPP_RES_LOAD_DIR=${SDRPP_RES_LOAD_DIR})
+add_definitions(-DSDRPP_MODULES_LOAD_DIR="${SDRPP_MODULES_LOAD_DIR}")
+add_definitions(-DSDRPP_RES_LOAD_DIR="${SDRPP_RES_LOAD_DIR}")
 
 # Created shared lib and link to core
 add_library(${PROJECT_NAME} SHARED ${SRC})