diff --git a/2011/richards/Makefile b/2011/richards/Makefile
index d736a7f06..d767f98a4 100644
--- a/2011/richards/Makefile
+++ b/2011/richards/Makefile
@@ -66,7 +66,7 @@ CINCLUDE= -include stdlib.h -include string.h -include stdio.h -include ctype.h
 
 # Optimization
 #
-OPT=
+OPT= -O3
 
 # Default flags for ANSI C compilation
 #