diff --git a/src/utils_private.cpp b/src/utils_private.cpp
index 2abe857..751b4a7 100644
--- a/src/utils_private.cpp
+++ b/src/utils_private.cpp
@@ -21,6 +21,7 @@
  */
  
 #include <cstdlib>
+#include <cstdio>
 #include <cstring>
 #include <cstdarg>
 #include <iostream>