diff --git a/src/frontend/inp.c b/src/frontend/inp.c
index c65fb77a7..3a581c40a 100644
--- a/src/frontend/inp.c
+++ b/src/frontend/inp.c
@@ -15,7 +15,7 @@ $Id$
  * the listing routines.
  */
 
-#ifndef _MSC_VER
+#ifdef HAVE_LIBGEN_H /* dirname() */
 #include <libgen.h>
 #endif
 #include "ngspice.h"
diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index 2ba3f27e5..895abfe81 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -30,7 +30,7 @@ Author: 1985 Wayne A. Christopher
  * Fixed crash where a NULL pointer gets freed in inp_readall()
  */
 
-#ifndef _MSC_VER
+#ifdef HAVE_LIBGEN_H /* dirname() */
 #include <libgen.h>
 #endif
 #include <config.h>