Fix problem with last commit
diff --git a/src/bc/bc.c b/src/bc/bc.c
index 2bb7c73..5abc12e 100644
--- a/src/bc/bc.c
+++ b/src/bc/bc.c
@@ -99,7 +99,7 @@
   BcStatus status;
   BcVm vm;
 
-  if (flags & BC_FLAG_INTERACTIVE || (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))) {
+  if ((flags & BC_FLAG_INTERACTIVE) || (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO))) {
     bcg.bc_interactive = 1;
   } else bcg.bc_interactive = 0;