diff --git a/undpu.c b/undpu.c
index a112e12..263addd 100644
--- a/undpu.c
+++ b/undpu.c
@@ -41,7 +41,7 @@ int main (int argc, char **argv){
 			return EXIT_FAILURE;
 		}
 	}
-	strncpy(output,argv[1],strlen(argv[1])-4);
+	strlcpy(output,argv[1],strlen(argv[1])-4);
 	if((joe = fopen(output,"w"))==NULL){
 		fputs("Ummm, the output file doesn't work.\n",stderr);
 		return EXIT_FAILURE;