diff --git a/app/main.c b/app/main.c
index 7478890..a3c7811 100644
--- a/app/main.c
+++ b/app/main.c
@@ -7,6 +7,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <libxml/parser.h>
+#include <string.h>
 
 #define TILESIZE 32
 #define WINWIDTH 30
@@ -26,6 +27,8 @@ static unsigned map[MAPWIDTH][MAPHEIGHT];
 
 int main(int argc, char *argv[])
 {
+	char path[MAX_PATH_LEN];
+
 	if (2 != argc) {
 		fprintf(stderr, "Usage: %s ASSETS-DIR\n", argv[0]);
 		return 1;
@@ -42,10 +45,10 @@ int main(int argc, char *argv[])
 
 	xmlDocPtr doc;
 	xmlNodePtr node;
-	char mappath[MAX_PATH_LEN];
-	strncpy(mappath, argv[1], MAX_PATH_LEN);
-	strncat(mappath, MAP_ASSET, MAX_PATH_LEN);
-	doc = xmlParseFile(mappath);
+	assert(strlen(argv[1]) + strlen(MAP_ASSET) < MAX_PATH_LEN);
+	strcpy(path, argv[1]);
+	strcat(path, MAP_ASSET);
+	doc = xmlParseFile(path);
 	assert(NULL != doc);
 	node = xmlDocGetRootElement(doc);
 	assert(0 == xmlStrcmp(node->name, (const xmlChar *)"map"));