diff --git a/gnu/usr.bin/bc/proto.h b/gnu/usr.bin/bc/proto.h
index 275a759578e6..dd3782d602d8 100644
--- a/gnu/usr.bin/bc/proto.h
+++ b/gnu/usr.bin/bc/proto.h
@@ -38,14 +38,8 @@
 #endif
 
 /* Include the standard library header files. */
-#ifndef NO_UNISTD
 #include <unistd.h>
-#endif
-#ifndef NO_STDLIB
-#ifdef __STDC__
 #include <stdlib.h>
-#endif
-#endif
 
 /* Define the _PROTOTYPE macro if it is needed. */