diff --git a/src/Dist.cpp b/src/Dist.cpp
index 50feec394f9d7cfa88e4807c0777bf8af8982c61..4203daa273306f151828c31d5af645e55957a3a3 100644
--- a/src/Dist.cpp
+++ b/src/Dist.cpp
@@ -6,6 +6,7 @@
 #include <numeric>
 #include "Dist.h"
 #include "macros.h"
+#include <cassert>
 
 using namespace GiNaC;