diff --git a/arch/sim/src/sim/CMakeLists.txt b/arch/sim/src/sim/CMakeLists.txt
index a0b26bb3017..875040d5ef0 100644
--- a/arch/sim/src/sim/CMakeLists.txt
+++ b/arch/sim/src/sim/CMakeLists.txt
@@ -213,7 +213,7 @@ if(CONFIG_SIM_X11FB)
   endif()
 endif()
 
-if(CONFIG_SIM_WIFIDEV_HOST)
+if(NOT ${CONFIG_SIM_WIFIDEV_NUMBER} EQUAL 0)
   add_compile_options(-DTOPDIR=$(TOPDIR))
   list(APPEND SRCS sim_wifihost.c)
 endif()