diff --git a/plugins/out_cloudwatch_logs/cloudwatch_api.c b/plugins/out_cloudwatch_logs/cloudwatch_api.c
index 8043968cfa8..f8fe75f25ea 100644
--- a/plugins/out_cloudwatch_logs/cloudwatch_api.c
+++ b/plugins/out_cloudwatch_logs/cloudwatch_api.c
@@ -1457,7 +1457,7 @@ int put_log_events(struct flb_cloudwatch *ctx, struct cw_flush *buf,
         flb_plg_debug(ctx->ins, "PutLogEvents http status=%d", c->resp.status);
 
         if (c->resp.status == 200) {
-            if (c->resp.data == NULL || c->resp.data_len == 0 || strstr(c->resp.data, AMZN_REQUEST_ID_HEADER) == NULL) {
+            if (c->resp.data == NULL || c->resp.data_len == 0 || strcasestr(c->resp.data, AMZN_REQUEST_ID_HEADER) == NULL) {
                 /* code was 200, but response is invalid, treat as failure */
                 if (c->resp.data != NULL) {
                     flb_plg_debug(ctx->ins, "Could not find sequence token in "