diff --git a/src/u_cx_log.c b/src/u_cx_log.c
index 3dc7b07..2b65fc9 100644
--- a/src/u_cx_log.c
+++ b/src/u_cx_log.c
@@ -53,6 +53,7 @@ static bool gUCxLogEnabled = true;
 
 void uCxLogPrintTime(void)
 {
+#if U_CX_PORT_PRINTF
     int32_t timestamp_ms = U_CX_PORT_GET_TIME_MS();
     int32_t ms      = (int32_t) (timestamp_ms % 1000);
     int32_t seconds = (int32_t) (timestamp_ms / 1000) % 60 ;
@@ -60,6 +61,7 @@ void uCxLogPrintTime(void)
     int32_t hours   = (int32_t) ((timestamp_ms / (1000 * 60 * 60)));
     U_CX_PORT_PRINTF("[%02" PRId32 ":%02" PRId32 ":%02" PRId32 ".%03" PRId32"]",
                      hours, minutes, seconds, ms);
+#endif
 }
 
 void uCxLogDisable(void)