diff --git a/bin/tests/sock_test.c b/bin/tests/sock_test.c
index 3422d5957a..fd8c8eb718 100644
--- a/bin/tests/sock_test.c
+++ b/bin/tests/sock_test.c
@@ -102,12 +102,12 @@ my_recv(isc_task_t *task, isc_event_t *event)
 	if (strcmp(event->arg, "so2")) {
 		region = dev->region;
 		strcpy(buf, "\r\nReceived: ");
-		strncat(buf, region.base, region.length);
+		strncat(buf, (char *)region.base, region.length);
 		buf[32] = 0;  /* ensure termination */
 		strcat(buf, "\r\n\r\n");
 		region.base = isc_mem_get(event->mctx, strlen(buf) + 1);
 		region.length = strlen(buf) + 1;
-		strcpy(region.base, buf);  /* strcpy is safe */
+		strcpy((char *)region.base, buf);  /* strcpy is safe */
 		isc_socket_send(sock, &region, task, my_send, event->arg);
 	} else {
 		region = dev->region;
@@ -187,7 +187,7 @@ my_connect(isc_task_t *task, isc_event_t *event)
 	strcpy(buf, "GET / HTTP/1.1\r\nHost: www.flame.org\r\nConnection: Close\r\n\r\n");
 	region.base = isc_mem_get(event->mctx, strlen(buf) + 1);
 	region.length = strlen(buf) + 1;
-	strcpy(region.base, buf);  /* strcpy is safe */
+	strcpy((char *)region.base, buf);  /* strcpy is safe */
 
 	isc_socket_send(sock, &region, task, my_http_get, event->arg);
 
diff --git a/lib/dns/name.c b/lib/dns/name.c
index 8a8bef4914..f43b38ca4f 100644
--- a/lib/dns/name.c
+++ b/lib/dns/name.c
@@ -140,7 +140,7 @@ static unsigned char maptolower[] = {
 
 static struct dns_name root = {
 	NAME_MAGIC,
-	"", 1, 1, NULL,
+	(unsigned char *)"", 1, 1, NULL,
 	{(void *)-1, (void *)-1}
 };
 
diff --git a/lib/isc/buffer.c b/lib/isc/buffer.c
index 047060585e..a17416dfad 100644
--- a/lib/isc/buffer.c
+++ b/lib/isc/buffer.c
@@ -27,7 +27,7 @@
 #define BUFFER_MAGIC			0x42756621U	/* Buf!. */
 
 void
-isc_buffer_init(isc_buffer_t *b, unsigned char *base, unsigned int length,
+isc_buffer_init(isc_buffer_t *b, void *base, unsigned int length,
 		unsigned int type) {
 	/*
 	 * Make 'b' refer to the 'length'-byte region starting at base.
@@ -105,7 +105,7 @@ isc_buffer_available(isc_buffer_t *b, isc_region_t *r) {
 	REQUIRE(VALID_BUFFER(b));
 	REQUIRE(r != NULL);
 
-	r->base = b->base + b->used;
+	r->base = (unsigned char *)b->base + b->used;
 	r->length = b->length - b->used;
 }
 
diff --git a/lib/isc/include/isc/buffer.h b/lib/isc/include/isc/buffer.h
index 2b935c144f..dbaf912106 100644
--- a/lib/isc/include/isc/buffer.h
+++ b/lib/isc/include/isc/buffer.h
@@ -110,7 +110,7 @@ typedef struct isc_buffer {
 
 
 void
-isc_buffer_init(isc_buffer_t *b, unsigned char *base, unsigned int length,
+isc_buffer_init(isc_buffer_t *b, void *base, unsigned int length,
 		unsigned int type);
 /*
  * Make 'b' refer to the 'length'-byte region starting at base.