diff --git a/contrib/gperf/src/stderr.c b/contrib/gperf/src/stderr.c
index f4e7aa11ce8..c24cf6e865c 100644
--- a/contrib/gperf/src/stderr.c
+++ b/contrib/gperf/src/stderr.c
@@ -20,6 +20,7 @@ along with GNU GPERF; see the file COPYING.  If not, write to
 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #include <stdio.h>
+#include <errno.h>
 #ifdef _HAVE_PARAM_H
 #include <sys/param.h>
 #endif