diff --git a/src/ppl-config.cc.in b/src/ppl-config.cc.in
index ffaf352..954a5fe 100644
--- a/src/ppl-config.cc.in
+++ b/src/ppl-config.cc.in
@@ -33,6 +33,7 @@ namespace PPL = Parma_Polyhedra_Library;
 #error "PPL version 0.8 or following is required"
 #endif
 
+#include <cassert>
 #include <cstdarg>
 #include <cstring>
 #include <cctype>