diff --git a/print.c b/print.c
index 5c803fb..e3d564f 100644
--- a/print.c
+++ b/print.c
@@ -103,7 +103,7 @@ vseprint(char *dst, char *edst, char *fmt, va_list arg)
 				{
 					static char digits[] = "0123456789abcdef";
 					char buf[30], *p;
-					int neg, zero;
+					int zero;
 					uvlong luv;
 				
 					if(fl&FlagLongLong){
@@ -126,10 +126,8 @@ vseprint(char *dst, char *edst, char *fmt, va_list arg)
 					}
 				
 					p = buf+sizeof buf;
-					neg = 0;
 					zero = 0;
 					if(!(fl&FlagUnsigned) && (vlong)luv < 0){
-						neg = 1;
 						luv = -luv;
 					}
 					if(luv == 0)
diff --git a/tcpproxy.c b/tcpproxy.c
index 6e9fa0d..fb2863b 100644
--- a/tcpproxy.c
+++ b/tcpproxy.c
@@ -52,7 +52,7 @@ taskmain(int argc, char **argv)
 	fdnoblock(fd);
 	while((cfd = netaccept(fd, remote, &rport)) >= 0){
 		fprintf(stderr, "connection from %s:%d\n", remote, rport);
-		taskcreate(proxytask, (void*)cfd, STACK);
+		taskcreate(proxytask, (void*)(uintptr_t)cfd, STACK);
 	}
 }
 
@@ -61,7 +61,7 @@ proxytask(void *v)
 {
 	int fd, remotefd;
 
-	fd = (int)v;
+	fd = (int)(uintptr_t)v;
 	if((remotefd = netdial(TCP, server, port)) < 0){
 		close(fd);
 		return;
diff --git a/testdelay.c b/testdelay.c
index 7974cb0..7848555 100644
--- a/testdelay.c
+++ b/testdelay.c
@@ -12,8 +12,8 @@ Channel *c;
 void
 delaytask(void *v)
 {
-	taskdelay((int)v);
-	printf("awake after %d ms\n", (int)v);
+	taskdelay((int)(uintptr_t)v);
+	printf("awake after %d ms\n", (int)(uintptr_t)v);
 	chansendul(c, 0);
 }
 
@@ -28,7 +28,7 @@ taskmain(int argc, char **argv)
 	for(i=1; i<argc; i++){
 		n++;
 		printf("x");
-		taskcreate(delaytask, (void*)atoi(argv[i]), STACK);
+		taskcreate(delaytask, (void*)(uintptr_t)atoi(argv[i]), STACK);
 	}
 
 	/* wait for n tasks to finish */