diff --git a/telnetlogger.c b/telnetlogger.c
index b8fda3e..035b531 100644
--- a/telnetlogger.c
+++ b/telnetlogger.c
@@ -630,7 +630,7 @@ open_output(int *in_i, char *argv[], int argc)
 	/* Create a file to output to*/
 	else {
 		FILE *fp;
-		fp = fopen(filename, "wt");
+		fp = fopen(filename, "at");
 		if (fp == NULL) {
 			perror(filename);
 			exit(1);