diff --git a/libdnet-stripped/NMAP_MODIFICATIONS b/libdnet-stripped/NMAP_MODIFICATIONS
index 6a7cd40d7..31d473b89 100644
--- a/libdnet-stripped/NMAP_MODIFICATIONS
+++ b/libdnet-stripped/NMAP_MODIFICATIONS
@@ -1899,7 +1899,7 @@ index 44e7dd2..47f3705 100644
  
  #include "dnet.h"
  
-+#ifdef RT_ROUNDUP
++#if defined(RT_ROUNDUP) && defined(__NetBSD__)
 +/* NetBSD defines this macro rounding to 64-bit boundaries.
 +   http://fxr.watson.org/fxr/ident?v=NETBSD;i=RT_ROUNDUP */
 +#define ROUNDUP(a) RT_ROUNDUP(a)
diff --git a/libdnet-stripped/src/route-bsd.c b/libdnet-stripped/src/route-bsd.c
index 47f370522..9bc4bb092 100644
--- a/libdnet-stripped/src/route-bsd.c
+++ b/libdnet-stripped/src/route-bsd.c
@@ -47,7 +47,7 @@
 
 #include "dnet.h"
 
-#ifdef RT_ROUNDUP
+#if defined(RT_ROUNDUP) && defined(__NetBSD__)
 /* NetBSD defines this macro rounding to 64-bit boundaries.
    http://fxr.watson.org/fxr/ident?v=NETBSD;i=RT_ROUNDUP */
 #define ROUNDUP(a) RT_ROUNDUP(a)