diff --git a/cbake.l b/cbake.l
index 6796588..7f09126 100644
--- a/cbake.l
+++ b/cbake.l
@@ -67,7 +67,7 @@ MACROS (@BAKE|@FILENAME|@FILE|@SHORT|@ARGS|@LINE|@STOP|$@|$*|$+)
 void root(char * filename) {
   char * path, * terminator;
   if (!(path = realpath(filename, NULL))) { return; }
-  if (terminator = strrchr(path, '/')) {
+  if ((terminator = strrchr(path, '/'))) {
     *terminator = '\0';
     chroot(path);
   }
diff --git a/test.a.txt b/test.a.txt
new file mode 100644
index 0000000..ca2ff7f
Binary files /dev/null and b/test.a.txt differ