diff --git a/lib/strverscmp.c b/lib/strverscmp.c
index bc5ba1f9d..b3926f25e 100644
--- a/lib/strverscmp.c
+++ b/lib/strverscmp.c
@@ -18,6 +18,10 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
 #include <string.h>
 #include <ctype.h>