diff --git a/firmware.scons b/firmware.scons
index 378b196a2..bbd4a54a4 100644
--- a/firmware.scons
+++ b/firmware.scons
@@ -216,6 +216,14 @@ sources.extend(
     )
 )
 
+# Link-Time Optimization for firmware dfu only, we are desperately out of flash space
+if ENV["COMPACT"]:
+    fwenv.Append(
+        CCFLAGS=[
+            "-flto",
+        ],
+    )
+
 # Debug
 # print(fwenv.Dump())