diff --git a/CMakeLists.txt b/CMakeLists.txt
index bcd31ca8..d906dc3b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -78,8 +78,8 @@ target_link_libraries(obs-websocket
 
 # --- Windows-specific build settings and tasks ---
 if(WIN32)
-	if(NOT DEFINED OBS_FRONTEND_LIB)
-		set(OBS_FRONTEND_LIB "OBS_FRONTEND_LIB-NOTFOUND" CACHE FILEPATH "OBS frontend library")
+	set(OBS_FRONTEND_LIB "NOTFOUND" CACHE FILEPATH "OBS frontend library")
+	if(OBS_FRONTEND_LIB STREQUAL "NOTFOUND")
 		message(FATAL_ERROR "Could not find OBS Frontend API's library !")
 	endif()