diff --git a/tool/Makefile b/tool/Makefile
index c23f3c7..27b3fdb 100644
--- a/tool/Makefile
+++ b/tool/Makefile
@@ -8,7 +8,7 @@ PREFIX=/usr/local
 
 PROG=gcn64ctl
 
-OBJS=main.o gcn64.o mempak.o gcn64lib.o hexdump.o gc2n64_adapter.o ihex.o
+OBJS=main.o gcn64.o mempak.o gcn64lib.o hexdump.o gc2n64_adapter.o ihex.o delay.o
 
 .PHONY : clean install
 
diff --git a/tool/delay.c b/tool/delay.c
new file mode 100644
index 0000000..adadf68
--- /dev/null
+++ b/tool/delay.c
@@ -0,0 +1,27 @@
+#ifdef LIBDRAGON
+#include <libdragon.h>
+
+void _delay_us(unsigned long us)
+{
+	wait_ms(us/1000);
+}
+
+void _delay_s(unsigned long s)
+{
+	wait_ms(s*1000);
+}
+
+#else
+#include <unistd.h>
+
+void _delay_us(unsigned long us)
+{
+	usleep(us);
+}
+
+void _delay_s(unsigned long s)
+{
+	sleep(s);
+}
+
+#endif
diff --git a/tool/delay.h b/tool/delay.h
new file mode 100644
index 0000000..b7c0270
--- /dev/null
+++ b/tool/delay.h
@@ -0,0 +1,2 @@
+void _delay_us(unsigned long us);
+void _delay_s(unsigned long s);
diff --git a/tool/gc2n64_adapter.c b/tool/gc2n64_adapter.c
index 677424d..6e979be 100644
--- a/tool/gc2n64_adapter.c
+++ b/tool/gc2n64_adapter.c
@@ -1,11 +1,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 #include "gcn64lib.h"
 #include "gc2n64_adapter.h"
 #include "hexdump.h"
 #include "ihex.h"
+#include "delay.h"
 
 int gc2n64_adapter_echotest(gcn64_hdl_t hdl, int verbose)
 {
@@ -184,7 +184,7 @@ int gc2n64_adapter_boot_waitNotBusy(gcn64_hdl_t hdl, int verbose)
 		}
 		printf("%c\b", spinner[c%4]); fflush(stdout);
 		c++;
-		usleep(50000);
+		_delay_us(50000);
 	}
 
 	return 0;
@@ -267,7 +267,7 @@ int gc2n64_adapter_enterBootloader(gcn64_hdl_t hdl)
 			return n;
 
 	// No answer since the effect is immediate.
-	usleep(100000);
+	_delay_us(100000);
 
 	return 0;
 }
@@ -390,7 +390,7 @@ int gc2n64_adapter_waitForBootloader(gcn64_hdl_t hdl, int timeout_s)
 			return 0;
 		}
 
-		sleep(1);
+		_delay_s(1);
 	}
 
 	return -1;