diff --git a/framework.mk b/framework.mk
index cb3e4f22..f2107a4c 100644
--- a/framework.mk
+++ b/framework.mk
@@ -28,11 +28,11 @@ CXXSRC += $(wildcard $(FRAMEWORK_PATH)/objectmanager/*.cpp)
 CXXSRC += $(wildcard $(FRAMEWORK_PATH)/osal/*.cpp)
 
 # select the OS
-ifeq ($(OS),rtems)
+ifeq ($(OS_FSFW),rtems)
 CXXSRC += $(wildcard $(FRAMEWORK_PATH)/osal/rtems/*.cpp)
-else ifeq ($(OS),linux)
+else ifeq ($(OS_FSFW),linux)
 CXXSRC += $(wildcard $(FRAMEWORK_PATH)/osal/linux/*.cpp)
-else ifeq ($(OS),freeRTOS)
+else ifeq ($(OS_FSFW),freeRTOS)
 CXXSRC += $(wildcard $(FRAMEWORK_PATH)/osal/FreeRTOS/*.cpp)
 else
 $(error invalid OS specified, valid OS are rtems, linux, freeRTOS)