diff --git a/src/exec_nopty.c b/src/exec_nopty.c
index 946608535..690dca68b 100644
--- a/src/exec_nopty.c
+++ b/src/exec_nopty.c
@@ -40,6 +40,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
+#include <termios.h>		/* for struct winsize on HP-UX */
 
 #include "sudo.h"
 #include "sudo_exec.h"