diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0afc945667b..e326f123646 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2139,7 +2139,7 @@ add_custom_command(
     COMMAND ${CMAKE_COMMAND}
         -DPROJECT_BINARY_DIR=${PROJECT_BINARY_DIR}
         -DAPPLICATION_SOURCE_DIR=${APPLICATION_SOURCE_DIR}
-        -DINTERFACE_INCLUDE_DIRECTORIES="$<JOIN:$<TARGET_PROPERTY:zephyr_interface,INTERFACE_INCLUDE_DIRECTORIES>,:>"
+        -DINTERFACE_INCLUDE_DIRECTORIES="$<TARGET_PROPERTY:zephyr_interface,INTERFACE_INCLUDE_DIRECTORIES>"
         -Dllext_edk_file=${llext_edk_file}
         -DAUTOCONF_H=${AUTOCONF_H}
         -Dllext_cflags="${llext_edk_cflags}"
diff --git a/cmake/llext-edk.cmake b/cmake/llext-edk.cmake
index d68e6939e69..91b4b0ef9ac 100644
--- a/cmake/llext-edk.cmake
+++ b/cmake/llext-edk.cmake
@@ -119,7 +119,6 @@ foreach(flag ${llext_cflags})
 endforeach()
 set(llext_cflags ${new_cflags})
 
-cmake_path(CONVERT "${INTERFACE_INCLUDE_DIRECTORIES}" TO_CMAKE_PATH_LIST include_dirs)
 
 set(autoconf_h_edk ${llext_edk_inc}/${AUTOCONF_H})
 cmake_path(RELATIVE_PATH AUTOCONF_H BASE_DIRECTORY ${PROJECT_BINARY_DIR} OUTPUT_VARIABLE autoconf_h_rel)
@@ -127,6 +126,7 @@ cmake_path(RELATIVE_PATH AUTOCONF_H BASE_DIRECTORY ${PROJECT_BINARY_DIR} OUTPUT_
 list(APPEND base_flags_make ${llext_cflags} ${imacros_make})
 list(APPEND base_flags_cmake ${llext_cflags} ${imacros_cmake})
 
+separate_arguments(include_dirs NATIVE_COMMAND ${INTERFACE_INCLUDE_DIRECTORIES})
 file(MAKE_DIRECTORY ${llext_edk_inc})
 foreach(dir ${include_dirs})
     if (NOT EXISTS ${dir})