diff --git a/src/ca/repeater.cpp b/src/ca/repeater.cpp
index d45d7a7aa..c0309929c 100644
--- a/src/ca/repeater.cpp
+++ b/src/ca/repeater.cpp
@@ -79,6 +79,7 @@
 
 #include <string>
 #include <stdexcept>
+#include <stdio.h>
 
 #define epicsAssertAuthor "Jeff Hill johill@lanl.gov"