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diff --git a/tests/DateTimetest.cpp b/tests/DateTimetest.cpp
index 0417349..2691c65 100644
--- a/tests/DateTimetest.cpp
+++ b/tests/DateTimetest.cpp
@@ -23,6 +23,8 @@
 
 #include <cassert>
 
+#include <cstdio>
+
 int main()
 {
     DateTime datum(0);