diff --git a/usbutils.c b/usbutils.c
index 4a3fbdc0..1a0fa75d 100644
--- a/usbutils.c
+++ b/usbutils.c
@@ -2416,18 +2416,17 @@ int _usb_read(struct cgpu_info *cgpu, int ep, char *buf, size_t bufsiz, int *pro
 			got = 0;
 
 			if (first && usbdev->usecps && usbdev->last_write_siz) {
-				cgtimer_t now, already;
+				cgtimer_t now, already_done;
 				double sleep_estimate;
 				double write_time = (double)(usbdev->last_write_siz) /
 						    (double)(usbdev->cps);
 
 				cgtimer_time(&now);
-				cgtimer_sub(&now, &usbdev->cgt_last_write, &already);
-				sleep_estimate = write_time - cgtimer_to_ms(&already);
-
-				cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
+				cgtimer_sub(&now, &usbdev->cgt_last_write, &already_done);
+				sleep_estimate = write_time - cgtimer_to_ms(&already_done);
 
 				if (sleep_estimate > 0.0) {
+					cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
 					cgpu->usbinfo.read_delay_count++;
 					cgpu->usbinfo.total_read_delay += sleep_estimate;
 				}
@@ -2521,18 +2520,17 @@ int _usb_read(struct cgpu_info *cgpu, int ep, char *buf, size_t bufsiz, int *pro
 		}
 		got = 0;
 		if (first && usbdev->usecps && usbdev->last_write_siz) {
-			cgtimer_t now, already;
+			cgtimer_t now, already_done;
 			double sleep_estimate;
 			double write_time = (double)(usbdev->last_write_siz) /
 					    (double)(usbdev->cps);
 
 			cgtimer_time(&now);
-			cgtimer_sub(&now, &usbdev->cgt_last_write, &already);
-			sleep_estimate = write_time - cgtimer_to_ms(&already);
-
-			cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
+			cgtimer_sub(&now, &usbdev->cgt_last_write, &already_done);
+			sleep_estimate = write_time - cgtimer_to_ms(&already_done);
 
 			if (sleep_estimate > 0.0) {
+				cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
 				cgpu->usbinfo.read_delay_count++;
 				cgpu->usbinfo.total_read_delay += sleep_estimate;
 			}
@@ -2660,18 +2658,17 @@ int _usb_write(struct cgpu_info *cgpu, int ep, char *buf, size_t bufsiz, int *pr
 		sent = 0;
 		if (usbdev->usecps) {
 			if (usbdev->last_write_siz) {
-				cgtimer_t now, already;
+				cgtimer_t now, already_done;
 				double sleep_estimate;
 				double write_time = (double)(usbdev->last_write_siz) /
 						    (double)(usbdev->cps);
 
 				cgtimer_time(&now);
-				cgtimer_sub(&now, &usbdev->cgt_last_write, &already);
-				sleep_estimate = write_time - cgtimer_to_ms(&already);
-
-				cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
+				cgtimer_sub(&now, &usbdev->cgt_last_write, &already_done);
+				sleep_estimate = write_time - cgtimer_to_ms(&already_done);
 
 				if (sleep_estimate > 0.0) {
+					cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
 					cgpu->usbinfo.write_delay_count++;
 					cgpu->usbinfo.total_write_delay += sleep_estimate;
 				}
@@ -2757,18 +2754,17 @@ int __usb_transfer(struct cgpu_info *cgpu, uint8_t request_type, uint8_t bReques
 
 	if (usbdev->usecps) {
 		if (usbdev->last_write_siz) {
-			cgtimer_t now, already;
+			cgtimer_t now, already_done;
 			double sleep_estimate;
 			double write_time = (double)(usbdev->last_write_siz) /
 					    (double)(usbdev->cps);
 
 			cgtimer_time(&now);
-			cgtimer_sub(&now, &usbdev->cgt_last_write, &already);
-			sleep_estimate = write_time - cgtimer_to_ms(&already);
-
-			cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
+			cgtimer_sub(&now, &usbdev->cgt_last_write, &already_done);
+			sleep_estimate = write_time - cgtimer_to_ms(&already_done);
 
 			if (sleep_estimate > 0.0) {
+				cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
 				cgpu->usbinfo.write_delay_count++;
 				cgpu->usbinfo.total_write_delay += sleep_estimate;
 			}
@@ -2835,18 +2831,17 @@ int _usb_transfer_read(struct cgpu_info *cgpu, uint8_t request_type, uint8_t bRe
 	*amount = 0;
 
 	if (usbdev->usecps && usbdev->last_write_siz) {
-		cgtimer_t now, already;
+		cgtimer_t now, already_done;
 		double sleep_estimate;
 		double write_time = (double)(usbdev->last_write_siz) /
 				    (double)(usbdev->cps);
 
 		cgtimer_time(&now);
-		cgtimer_sub(&now, &usbdev->cgt_last_write, &already);
-		sleep_estimate = write_time - cgtimer_to_ms(&already);
-
-		cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
+		cgtimer_sub(&now, &usbdev->cgt_last_write, &already_done);
+		sleep_estimate = write_time - cgtimer_to_ms(&already_done);
 
 		if (sleep_estimate > 0.0) {
+			cgsleep_ms_r(&usbdev->cgt_last_write, write_time * 1000.0);
 			cgpu->usbinfo.read_delay_count++;
 			cgpu->usbinfo.total_read_delay += sleep_estimate;
 		}