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-rw-r--r--src/libstddjb/bitarray_not.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstddjb/bitarray_not.c b/src/libstddjb/bitarray_not.c
index 6c4149e..1e9f5af 100644
--- a/src/libstddjb/bitarray_not.c
+++ b/src/libstddjb/bitarray_not.c
@@ -7,7 +7,7 @@ void bitarray_not (unsigned char *s, size_t a, size_t b)
   if (!b) return ;
   b += a ;
   if ((a >> 3) == ((b-1) >> 3))
-    s[a>>3] ^= ((1 << (a & 7)) - 1) ^ ((a << (b & 7)) - 1) ;
+    s[a>>3] ^= ((1 << (a & 7)) - 1) ^ ((1 << (1 + (b-1 & 7))) - 1) ;
   else
   {
     size_t i = (a>>3) + 1 ;