diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index 62d7b194..c11f13a4 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -1016,13 +1016,13 @@ check_curl_config_wrapper process_arguments(int argc, char **argv) {
 			}
 			break;
 		case TIMEOUT_RESULT:
-			if (!strcmp(optarg, "0") || !strcmp(optarg, "ok")) {
+			if (!strcmp(optarg, "0") || !strcasecmp(optarg, "ok")) {
 				result.config.on_timeout_result_state = STATE_OK;
-			} else if (!strcmp(optarg, "1") || !strcmp(optarg, "warning")) {
+			} else if (!strcmp(optarg, "1") || !strcasecmp(optarg, "warning")) {
 				result.config.on_timeout_result_state = STATE_WARNING;
-			} else if (!strcmp(optarg, "2") || !strcmp(optarg, "critical")) {
+			} else if (!strcmp(optarg, "2") || !strcasecmp(optarg, "critical")) {
 				result.config.on_timeout_result_state = STATE_CRITICAL;
-			} else if (!strcmp(optarg, "3") || !strcmp(optarg, "unknown")) {
+			} else if (!strcmp(optarg, "3") || !strcasecmp(optarg, "unknown")) {
 				result.config.on_timeout_result_state = STATE_UNKNOWN;
 			} else {
 				usage2(_("Invalid timeout-result state option, give either a return code or state "
diff --git a/plugins/check_http.c b/plugins/check_http.c
index 04397c29..af5dba81 100644
--- a/plugins/check_http.c
+++ b/plugins/check_http.c
@@ -301,13 +301,13 @@ bool process_arguments(int argc, char **argv) {
 			}
 			break;
 		case TIMEOUT_RESULT:
-			if (!strcmp(optarg, "0") || !strcmp(optarg, "ok")) {
+			if (!strcmp(optarg, "0") || !strcasecmp(optarg, "ok")) {
 				socket_timeout_state = STATE_OK;
-			} else if (!strcmp(optarg, "1") || !strcmp(optarg, "warning")) {
+			} else if (!strcmp(optarg, "1") || !strcasecmp(optarg, "warning")) {
 				socket_timeout_state = STATE_WARNING;
-			} else if (!strcmp(optarg, "2") || !strcmp(optarg, "critical")) {
+			} else if (!strcmp(optarg, "2") || !strcasecmp(optarg, "critical")) {
 				socket_timeout_state = STATE_CRITICAL;
-			} else if (!strcmp(optarg, "3") || !strcmp(optarg, "unknown")) {
+			} else if (!strcmp(optarg, "3") || !strcasecmp(optarg, "unknown")) {
 				socket_timeout_state = STATE_UNKNOWN;
 			} else {
 				usage2(_("Invalid timeout-result state option, give either a return code or state "