diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 0c4470b..48201f9 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -1,6 +1,6 @@
 idf_component_register(SRCS "eis4.c" "eis.c" "echem.c" "protocol.c" "wifi_transport.c" "temp.c" "refs.c"
                        INCLUDE_DIRS "."
-                       REQUIRES ad5941 ad5941_port nvs_flash esp_wifi esp_netif esp_event)
+                       REQUIRES ad5941 ad5941_port nvs_flash esp_wifi esp_netif esp_event esp_timer)
 
 if(DEFINED ENV{WIFI_SSID})
     target_compile_definitions(${COMPONENT_LIB} PRIVATE