diff --git a/src/libprs500/communicate.py b/src/libprs500/communicate.py
index 96cc00f2f3..5aa09452de 100755
--- a/src/libprs500/communicate.py
+++ b/src/libprs500/communicate.py
@@ -375,7 +375,7 @@ class PRS500Device(Device):
             rsize = size
             if size % msize:
                 rsize = size - size % msize + msize
-            data = data_type(self.handle.bulk_read(self.BULK_IN_EP, rsize)[:size])
+            data = data_type(self.handle.bulk_read(self.BULK_IN_EP, rsize))
             if self.log_packets: 
                 self.log_packet(data, "Answer d->h")
             return data
diff --git a/src/libprs500/libusb.py b/src/libprs500/libusb.py
index 28fd023d19..8e1be2329d 100644
--- a/src/libprs500/libusb.py
+++ b/src/libprs500/libusb.py
@@ -253,6 +253,8 @@ class DeviceHandle(Structure):
         if rsize < 0:
                 raise Error('Could not read ' + str(size) + ' bytes on the '\
                             'bulk bus. Error code: ' + str(rsize))
+        if rsize < size:
+            arr = arr[:rsize]
         return arr
         
     def bulk_write(self, endpoint, bytes, timeout=100):