diff --git a/src/unix/dialup.cpp b/src/unix/dialup.cpp
index 859e027307..79b35d5370 100644
--- a/src/unix/dialup.cpp
+++ b/src/unix/dialup.cpp
@@ -677,6 +677,7 @@ wxDialUpManagerImpl::CheckIfconfig()
         wxString cmd = wxT("/bin/sh -c \'");
         cmd << m_IfconfigPath;
 #if defined(__AIX__) || \
+    defined(__NETBSD__) || \
     defined(__OSF__) || \
     defined(__SOLARIS__) || defined (__SUNOS__)
         // need to add -a flag