diff --git a/src/StreamEpics.cc b/src/StreamEpics.cc
index b86f4c3..bfc61a9 100644
--- a/src/StreamEpics.cc
+++ b/src/StreamEpics.cc
@@ -25,6 +25,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #if defined(vxWorks)
 #include <symLib.h>