diff --git a/cmake/nuttx_add_luamod.cmake b/cmake/nuttx_add_luamod.cmake
index e40e29d1d..e0daa90b4 100644
--- a/cmake/nuttx_add_luamod.cmake
+++ b/cmake/nuttx_add_luamod.cmake
@@ -22,7 +22,7 @@
 
 set(LUAMOD_DIR ${NUTTX_BINARY_DIR}/luamod)
 
-if(NOT EXISTS {LUAMOD_DIR})
+if(NOT EXISTS ${LUAMOD_DIR})
   file(MAKE_DIRECTORY ${LUAMOD_DIR})
 endif()