diff --git a/inst/cta/src/GCTAEventList.cpp b/inst/cta/src/GCTAEventList.cpp
index 7ab3df6..9cefe89 100644
--- a/inst/cta/src/GCTAEventList.cpp
+++ b/inst/cta/src/GCTAEventList.cpp
@@ -29,6 +29,7 @@
 #include <config.h>
 #endif
 #include <typeinfo>
+#include <cstdio>     // sprintf
 #include "GTools.hpp"
 #include "GMath.hpp"
 #include "GFilename.hpp"