diff --git a/src/fsfw/osal/CMakeLists.txt b/src/fsfw/osal/CMakeLists.txt
index f3c5cfad..8fa353c6 100644
--- a/src/fsfw/osal/CMakeLists.txt
+++ b/src/fsfw/osal/CMakeLists.txt
@@ -18,7 +18,7 @@ elseif(FSFW_OSAL MATCHES "host")
 
 else()
 
-    message(WARNING "The OS_FSFW variable was not set. Assuming host OS..")
+    message(WARNING "${MSG_PREFIX} The FSFW_OSAL variable was not set. Assuming host OS..")
     # Not set. Assumuing this is a host build, try to determine host OS
     if (WIN32)
         add_subdirectory(host)