diff --git a/CommonLibs/BitVector.cpp b/CommonLibs/BitVector.cpp
index 1d13dec..54a3edc 100644
--- a/CommonLibs/BitVector.cpp
+++ b/CommonLibs/BitVector.cpp
@@ -564,7 +564,7 @@
 	unsigned whole = bytes*8;
 	unsigned rem = size() - whole;
 	if (rem==0) return;
-	fillField(whole,src[bytes],rem);
+        fillField(whole,src[bytes] >> (8-rem),rem);
 }
 
 void BitVector::hex(ostream& os) const