diff --git a/src/client.c b/src/client.c
index 0f951ac..c6236f6 100644
--- a/src/client.c
+++ b/src/client.c
@@ -1395,7 +1395,7 @@ handshake_version(int dns_fd, int *seed)
 
 	for (i = 0; running && i < 5; i++) {
 
-		send_version(dns_fd, VERSION);
+		send_version(dns_fd, PROTOCOL_VERSION);
 
 		read = handshake_waitdns(dns_fd, in, sizeof(in), 'v', 'V', i+1);
 
@@ -1411,11 +1411,12 @@ handshake_version(int dns_fd, int *seed)
 				userid_char = hex[userid & 15];
 				userid_char2 = hex2[userid & 15];
 
-				fprintf(stderr, "Version ok, both using protocol v 0x%08x. You are user #%d\n", VERSION, userid);
+				fprintf(stderr, "Version ok, both using protocol v 0x%08x. You are user #%d\n",
+					PROTOCOL_VERSION, userid);
 				return 0;
 			} else if (strncmp("VNAK", in, 4) == 0) {
 				warnx("You use protocol v 0x%08x, server uses v 0x%08x. Giving up",
-						VERSION, payload);
+						PROTOCOL_VERSION, payload);
 				return 1;
 			} else if (strncmp("VFUL", in, 4) == 0) {
 				warnx("Server full, all %d slots are taken. Try again later", payload);
diff --git a/src/iodined.c b/src/iodined.c
index cdfc920..82a82eb 100644
--- a/src/iodined.c
+++ b/src/iodined.c
@@ -765,7 +765,7 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
 					   ((unpacked[3] & 0xff)));
 		}
 
-		if (version == VERSION) {
+		if (version == PROTOCOL_VERSION) {
 			userid = find_available_user();
 			if (userid >= 0) {
 				int i;
@@ -826,7 +826,7 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
 					format_addr(&q->from, q->fromlen));
 			}
 		} else {
-			send_version_response(dns_fd, VERSION_NACK, VERSION, 0, q);
+			send_version_response(dns_fd, VERSION_NACK, PROTOCOL_VERSION, 0, q);
 			syslog(LOG_INFO, "dropped user from %s, sent bad version %08X",
 				format_addr(&q->from, q->fromlen), version);
 		}
diff --git a/src/version.h b/src/version.h
index 2ab00ff..67b7c42 100644
--- a/src/version.h
+++ b/src/version.h
@@ -20,7 +20,7 @@
 
 /* This is the version of the network protocol
    It is usually equal to the latest iodine version number */
-#define VERSION 0x00000502
+#define PROTOCOL_VERSION 0x00000502
 
 #endif /* _VERSION_H_ */