diff --git a/1instance.c b/1instance.c
index 78d6b27..8feadb5 100644
--- a/1instance.c
+++ b/1instance.c
@@ -4,6 +4,7 @@
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
+#include <stdio.h>
 
 typedef struct {
   char* filename; /* this file is the pipe (set by user) */
diff --git a/Makefile b/Makefile
index e9ad57b..d2a552d 100644
--- a/Makefile
+++ b/Makefile
@@ -54,9 +54,13 @@ example: example.o libvncserver.a
 pnmshow: pnmshow.o libvncserver.a
 	$(CC) -o pnmshow pnmshow.o $(LIBS)
 
+mac.o: mac.c 1instance.c
+
 OSXvnc-server: mac.o libvncserver.a
 	$(CC) -o OSXvnc-server mac.o $(LIBS) $(OSX_LIBS)
 
+x11vnc.o: x11vnc.c 1instance.c
+
 x11vnc: x11vnc.o libvncserver.a
 	$(CC) -o x11vnc x11vnc.o libvncserver.a -lz -ljpeg $(XLIBS)