diff --git a/limits.c b/limits.c
index 6444c8d..d16b9b4 100644
--- a/limits.c
+++ b/limits.c
@@ -71,9 +71,9 @@ static void homing_cycle(bool x_axis, bool y_axis, bool z_axis, bool reverse_dir
     // Check if we are done
     if(!(x_axis || y_axis || z_axis)) { return; }
     STEPPING_PORT |= out_bits & STEP_MASK;
-    _delay_us(settings.pulse_microseconds);
+    delay_us(settings.pulse_microseconds);
     STEPPING_PORT ^= out_bits & STEP_MASK;
-    _delay_us(step_delay);
+    delay_us(step_delay);
   }
   return;
 }
diff --git a/nuts_bolts.c b/nuts_bolts.c
index 3c699c3..97137a3 100644
--- a/nuts_bolts.c
+++ b/nuts_bolts.c
@@ -3,7 +3,8 @@
   Part of Grbl
 
   Copyright (c) 2009-2011 Simen Svale Skogsrud
-
+  Copyright (c) 2011-2012 Sungeun K. Jeon  
+  
   Grbl is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
@@ -43,3 +44,10 @@ void delay_ms(uint16_t ms)
 {
   while ( ms-- ) { _delay_ms(1); }
 }
+
+// Delays variable defined microseconds. Compiler compatibility fix for _delay_us(),
+// which only accepts constants in future compiler releases.
+void delay_us(uint16_t us) 
+{
+  while ( us-- ) { _delay_us(1); }
+}
diff --git a/nuts_bolts.h b/nuts_bolts.h
index ae71773..4f4f553 100644
--- a/nuts_bolts.h
+++ b/nuts_bolts.h
@@ -3,7 +3,7 @@
   Part of Grbl
 
   Copyright (c) 2009-2011 Simen Svale Skogsrud
-  Copyright (c) 2011 Sungeun K. Jeon  
+  Copyright (c) 2011-2012 Sungeun K. Jeon  
 
   Grbl is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -45,4 +45,7 @@ int read_double(char *line, uint8_t *char_counter, double *double_ptr);
 // Delays variable-defined milliseconds. Compiler compatibility fix for _delay_ms().
 void delay_ms(uint16_t ms);
 
+// Delays variable-defined microseconds. Compiler compatibility fix for _delay_us().
+void delay_us(uint16_t us);
+
 #endif