diff --git a/builder/main.py b/builder/main.py
index e19ea8f..4b748bb 100644
--- a/builder/main.py
+++ b/builder/main.py
@@ -232,7 +232,7 @@ else:
         target_firm = env.ElfToBin(
             join("$BUILD_DIR", "${PROGNAME}"), target_elf)
 
-env.AddPlatformTarget("buildfs", target_firm, None, "Build Filesystem Image")
+env.AddPlatformTarget("buildfs", target_firm, target_firm, "Build Filesystem Image")
 AlwaysBuild(env.Alias("nobuild", target_firm))
 target_buildprog = env.Alias("buildprog", target_firm, target_firm)