diff --git a/cde/programs/dthello/dthello.c b/cde/programs/dthello/dthello.c
index 6fb5c6a0f..42c73899c 100644
--- a/cde/programs/dthello/dthello.c
+++ b/cde/programs/dthello/dthello.c
@@ -73,6 +73,7 @@
 #include <sys/signal.h>
 #include <Xm/Xm.h>
 #include <Dt/GetDispRes.h>
+#include <Dt/HourGlass.h>
 #include <limits.h>
 #include <locale.h>
 #ifndef NO_MESSAGE_CATALOG