diff --git a/undpu.c b/undpu.c
index 1aa6c33..4c880aa 100644
--- a/undpu.c
+++ b/undpu.c
@@ -57,10 +57,12 @@ int main (int argc, char **argv){
 			return EXIT_FAILURE;
 		}
 	}
-	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;
+	if(!out){
+		strlcpy(output,argv[0],strlen(argv[0])-4);
+		if((joe = fopen(output,"w"))==NULL){
+			fputs("Ummm, the output file doesn't work.\n",stderr);
+			return EXIT_FAILURE;
+		}
 	}
 	while((thing=fgetc(bob))!=EOF){
 		fputc(thing,joe);