diff --git a/src/makeint.h b/src/makeint.h
index de9b3dda..b568b2a8 100644
--- a/src/makeint.h
+++ b/src/makeint.h
@@ -115,7 +115,7 @@ extern int errno;
 #endif
 
 /* Some systems define _POSIX_VERSION but are not really POSIX.1.  */
-#if (defined (butterfly) || defined (__arm) || (defined (__mips) && defined (_SYSTYPE_SVR3)) || (defined (sequent) && defined (i386)))
+#if (defined (butterfly) || (defined (__mips) && defined (_SYSTYPE_SVR3)) || (defined (sequent) && defined (i386)))
 # undef POSIX
 #endif