diff --git a/launchers/darwin/CMakeLists.txt b/launchers/darwin/CMakeLists.txt
index 4da675fcc9..9592ef69f3 100644
--- a/launchers/darwin/CMakeLists.txt
+++ b/launchers/darwin/CMakeLists.txt
@@ -67,7 +67,7 @@ add_executable(${PROJECT_NAME} MACOSX_BUNDLE ${src_files})
 set_target_properties(${PROJECT_NAME} PROPERTIES OUTPUT_NAME ${APP_NAME}
   MACOSX_BUNDLE_BUNDLE_NAME ${APP_NAME})
 set_from_env(LAUNCHER_HMAC_SECRET LAUNCHER_HMAC_SECRET "")
-if (LAUNCHER_HMAC_SECRET STREQUAL "")
+if ("${LAUNCHER_HMAC_SECRET}" STREQUAL "")
     message(FATAL_ERROR "LAUNCHER_HMAC_SECRET is not set")
 endif()