diff --git a/src/modules/navigator/module.mk b/src/modules/navigator/module.mk
index c075903b75..fb8d079010 100644
--- a/src/modules/navigator/module.mk
+++ b/src/modules/navigator/module.mk
@@ -63,3 +63,5 @@ INCLUDE_DIRS	 += $(MAVLINK_SRC)/include/mavlink
 MODULE_STACKSIZE = 1200
 
 EXTRACXXFLAGS	= -Weffc++
+
+MAXOPTIMIZATION = -Os