diff --git a/firmware/hackrf_usb/usb.c b/firmware/hackrf_usb/usb.c
index 5a151aec..a44d9164 100644
--- a/firmware/hackrf_usb/usb.c
+++ b/firmware/hackrf_usb/usb.c
@@ -90,25 +90,25 @@ static void usb_clear_all_pending_interrupts() {
 static void usb_wait_for_endpoint_priming_to_finish(const uint32_t mask) {
 	// Wait until controller has parsed new transfer descriptors and prepared
 	// receive buffers.
-    while( USB0_ENDPTPRIME & mask );
+        while( USB0_ENDPTPRIME & mask );
 }
 
 static void usb_flush_endpoints(const uint32_t mask) {
 	// Clear any primed buffers. If a packet is in progress, that transfer
 	// will continue until completion.
-    USB0_ENDPTFLUSH = mask;
+        USB0_ENDPTFLUSH = mask;
 }
 
 static void usb_wait_for_endpoint_flushing_to_finish(const uint32_t mask) {
 	// Wait until controller has flushed all endpoints / cleared any primed
 	// buffers.
-    while( USB0_ENDPTFLUSH & mask );
+        while( USB0_ENDPTFLUSH & mask );
 }
 
 static void usb_flush_primed_endpoints(const uint32_t mask) {
-    usb_wait_for_endpoint_priming_to_finish(mask);
+        usb_wait_for_endpoint_priming_to_finish(mask);
 	usb_flush_endpoints(mask);
-    usb_wait_for_endpoint_flushing_to_finish(mask);
+        usb_wait_for_endpoint_flushing_to_finish(mask);
 }
 
 static void usb_flush_all_primed_endpoints() {