diff --git a/ports/raspberrypi/Makefile b/ports/raspberrypi/Makefile
index f6d1555f8fd2..d6d239f39c45 100644
--- a/ports/raspberrypi/Makefile
+++ b/ports/raspberrypi/Makefile
@@ -207,7 +207,7 @@ CFLAGS += $(OPTIMIZATION_FLAGS)
 CFLAGS += $(CFLAGS_CYW43)
 #Debugging/Optimization
 ifeq ($(DEBUG), 1)
-  CFLAGS += -ggdb3 -O3
+  CFLAGS += -ggdb3 -Og
   # No LTO because we may place some functions in RAM instead of flash.
 else
   CFLAGS += -DNDEBUG