diff --git a/programmer.h b/programmer.h
index a22bdd2..2ea7b48 100644
--- a/programmer.h
+++ b/programmer.h
@@ -250,6 +250,7 @@
 /* udelay.c */
 void myusec_delay(int usecs);
 void myusec_calibrate_delay(void);
+void internal_sleep(int usecs);
 void internal_delay(int usecs);
 
 #if CONFIG_INTERNAL == 1