diff --git a/Makefile b/Makefile
index ca033fe..fce02f7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 
-CPPFLAGS=-O
+CPPFLAGS=-O3
 
 all:	emu816
 
diff --git a/program.cc b/program.cc
index f64b31e..44f714d 100644
--- a/program.cc
+++ b/program.cc
@@ -25,6 +25,8 @@
 
 using namespace std;
 
+#include <string.h>
+
 #include "mem816.h"
 #include "emu816.h"
 
@@ -150,4 +152,4 @@ int main(int argc, char **argv)
 	for (;;) loop();
 
 	return(0);
-}
\ No newline at end of file
+}