diff --git a/avr/modules/owimaster/main.asm b/avr/modules/owimaster/main.asm
index c1dc609..f4fe71b 100644
--- a/avr/modules/owimaster/main.asm
+++ b/avr/modules/owimaster/main.asm
@@ -40,9 +40,13 @@ OwiMaster_Init:
 
 OwiMaster_Reset:
   ; send RESET pulse (min. 480usec)
-  sbi OWI_DDR, OWI_PINNUM     ; set to output
-  cbi OWI_PORTOUT, OWI_PINNUM ; set value to zero
-  Utils_WaitNanoSecs 500000, 0, r22
+  sbi OWI_DDR, OWI_PINNUM         ; set to output
+  cbi OWI_PORTOUT, OWI_PINNUM     ; set value to zero
+  rcall Utils_WaitFor100MicroSecs ; wait for about 500 usecs
+  rcall Utils_WaitFor100MicroSecs
+  rcall Utils_WaitFor100MicroSecs
+  rcall Utils_WaitFor100MicroSecs
+  rcall Utils_WaitFor100MicroSecs
   cbi OWI_DDR, OWI_PINNUM     ; set to input
 
   ; if present slave pulls line low for 60 usecs (we check after 30 usecs)