diff --git a/coreapi/lime.c b/coreapi/lime.c
index 3d0084567..1ee677307 100644
--- a/coreapi/lime.c
+++ b/coreapi/lime.c
@@ -880,7 +880,7 @@ int lime_im_encryption_engine_process_incoming_message_cb(LinphoneImEncryptionEn
 			fclose(CACHEFD);
 			cacheXml = xmlParseDoc((xmlChar*)cacheString);
 			ms_free(cacheString);
-			retval = lime_decryptMultipartMessage(cacheXml, (uint8_t *)msg->message, &decrypted_body, &decrypted_content_type, lp_config_get_int(lc->config, "sip", "lime_key_validity", 0));
+			retval = lime_decryptMultipartMessage(cacheXml, (uint8_t *)msg->message, &decrypted_body, &decrypted_content_type, bctbx_time_string_to_sec(lp_config_get_string(lc->config, "sip", "lime_key_validity", "0")));
 			if (retval != 0) {
 				ms_warning("Unable to decrypt message, reason : %s", lime_error_code_to_string(retval));
 				if (decrypted_body) ms_free(decrypted_body);
diff --git a/coreapi/linphonecall.c b/coreapi/linphonecall.c
index f72ac5f58..abb00367f 100644
--- a/coreapi/linphonecall.c
+++ b/coreapi/linphonecall.c
@@ -2531,7 +2531,7 @@ void linphone_call_init_audio_stream(LinphoneCall *call){
 			/*call->current_params.media_encryption will be set later when zrtp is activated*/
 			params.zid_file=lc->zrtp_secrets_cache;
 			params.uri=uri;
-			params.limeKeyTimeSpan = lp_config_get_int(lc->config, "sip", "lime_key_validity", 0); /* get key lifespan from config file, default is 0:forever valid */
+			params.limeKeyTimeSpan = bctbx_time_string_to_sec(lp_config_get_string(lc->config, "sip", "lime_key_validity", "0")); /* get key lifespan from config file, default is 0:forever valid */
 			setZrtpCryptoTypesParameters(&params,call->core);
 			audio_stream_enable_zrtp(call->audiostream,&params);
 			if (uri != NULL) ms_free(uri);