diff --git a/librtprocess/src/include/LUT.h b/librtprocess/src/include/LUT.h
index 5097fd3c8..874ff5ac3 100644
--- a/librtprocess/src/include/LUT.h
+++ b/librtprocess/src/include/LUT.h
@@ -63,6 +63,7 @@
 #include <cstdint>
 #ifndef NDEBUG
 #include <cassert>
+#include <cstdio>
 #endif
 #include "opthelper.h"
 #include "rt_math.h"