diff --git a/tools/sky/Makefile b/tools/sky/Makefile
index 0b1fa08db..be3caa44b 100644
--- a/tools/sky/Makefile
+++ b/tools/sky/Makefile
@@ -22,4 +22,4 @@ endif
 all:	$(SERIALDUMP)
 
 $(SERIALDUMP):	serialdump.c
-	$(CC) -o $@ $<
+	$(CC) -O2 -o $@ $<
diff --git a/tools/sky/serialdump-linux b/tools/sky/serialdump-linux
index 8c7af779d..8bb8192c2 100755
Binary files a/tools/sky/serialdump-linux and b/tools/sky/serialdump-linux differ