diff --git a/client/flash.c b/client/flash.c
index ec76d65d..7f77d3cd 100644
--- a/client/flash.c
+++ b/client/flash.c
@@ -336,7 +336,7 @@ static int enter_bootloader(char *serial_port_name)
 
 		fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);
 		do {
-			sleep(1);
+			msleep(1000);
 			fprintf(stderr, ".");
 		} while (!OpenProxmark(0));
 		fprintf(stderr," Found.\n");
diff --git a/client/flasher.c b/client/flasher.c
index 9bc52e94..788d2348 100644
--- a/client/flasher.c
+++ b/client/flasher.c
@@ -135,7 +135,7 @@ int main(int argc, char **argv)
   
 	fprintf(stderr, "Waiting for Proxmark to appear on %s", serial_port_name);
 	do {
-		sleep(1);
+		msleep(1000);
 		fprintf(stderr, ".");
 	} while (!OpenProxmark(0));
 
diff --git a/client/hid-flasher/flash.c b/client/hid-flasher/flash.c
index e88e2121..7f03ebab 100644
--- a/client/hid-flasher/flash.c
+++ b/client/hid-flasher/flash.c
@@ -333,9 +333,9 @@ static int enter_bootloader(void)
 		fprintf(stderr,"Waiting for Proxmark to reappear on USB...");
 
 		CloseProxmark();
-		sleep(1);
+		msleep(1000);
 		while (!OpenProxmark(0)) {
-			sleep(1);
+			msleep(1000);
 			fprintf(stderr, ".");
 		}
 		fprintf(stderr," Found.\n");
diff --git a/client/hid-flasher/flasher.c b/client/hid-flasher/flasher.c
index a7faf171..ac7df69e 100644
--- a/client/hid-flasher/flasher.c
+++ b/client/hid-flasher/flasher.c
@@ -59,7 +59,7 @@ int main(int argc, char **argv)
 
 	fprintf(stderr, "Waiting for Proxmark to appear on USB...");
 	while (!OpenProxmark(1)) {
-		sleep(1);
+		msleep(1000);
 		fprintf(stderr, ".");
 	}
 	fprintf(stderr, " Found.\n");
diff --git a/client/hid-flasher/proxusb.c b/client/hid-flasher/proxusb.c
index e69636ae..3b96be37 100644
--- a/client/hid-flasher/proxusb.c
+++ b/client/hid-flasher/proxusb.c
@@ -42,7 +42,7 @@ void SendCommand(UsbCommand *c)
       usb_close(devh);
       devh = NULL;
     }
-    while(!OpenProxmark(0)) { sleep(1); }
+    while(!OpenProxmark(0)) { msleep(1000); }
     printf(PROXPROMPT);
     fflush(NULL);
 
@@ -69,7 +69,7 @@ bool ReceiveCommandPoll(UsbCommand *c)
         usb_close(devh);
         devh = NULL;
       }
-      while(!OpenProxmark(0)) { sleep(1); }
+      while(!OpenProxmark(0)) { msleep(1000); }
       printf(PROXPROMPT);
       fflush(NULL);