diff --git a/polly/lib/Analysis/ScopInfo.cpp b/polly/lib/Analysis/ScopInfo.cpp
index ec16088..3e0573bd 100644
--- a/polly/lib/Analysis/ScopInfo.cpp
+++ b/polly/lib/Analysis/ScopInfo.cpp
@@ -3406,6 +3406,8 @@
 
   auto Res = isl_union_set_foreach_set(USet, &mapToDimension_AddSet, &Data);
 
+  (void)Res;
+
   assert(Res == isl_stat_ok);
 
   isl_union_set_free(USet);