diff --git a/src/olympic/turbine/src/CMakeLists.txt b/src/olympic/turbine/src/CMakeLists.txt
index 1e9a57c6..1e647f7d 100644
--- a/src/olympic/turbine/src/CMakeLists.txt
+++ b/src/olympic/turbine/src/CMakeLists.txt
@@ -1,10 +1,15 @@
 add_library(Turbine)
 
-set(TURBINE_BACKEND_GBA ${TURBINE_BUILD_TYPE} STREQUAL "GBA")
-set(TURBINE_BACKEND_GLFW NOT ${TURBINE_BACKEND_GBA})
+if(TURBINE_BUILD_TYPE STREQUAL "GBA")
+	set(TURBINE_BACKEND_GBA TRUE)
+	set(TURBINE_BACKEND_GLFW FALSE)
+else()
+	set(TURBINE_BACKEND_GBA FALSE)
+	set(TURBINE_BACKEND_GLFW TRUE)
+endif()
 
 add_subdirectory(gba)
-if(${TURBINE_BACKEND_GLFW})
+if(TURBINE_BACKEND_GLFW)
 	add_subdirectory(glfw)
 endif()