diff --git a/plugins/in_stdin/in_stdin.c b/plugins/in_stdin/in_stdin.c
index 427aacd8d21..692e54a3c53 100644
--- a/plugins/in_stdin/in_stdin.c
+++ b/plugins/in_stdin/in_stdin.c
@@ -279,6 +279,7 @@ static int in_stdin_init(struct flb_input_instance *in,
     if (!ctx) {
         return -1;
     }
+    memset(ctx, 0, sizeof(struct flb_in_stdin_config));
 
     /* Initialize stdin config */
     ret = in_stdin_config_init(ctx, in, config);