diff --git a/polly/lib/CodeGen/IslNodeBuilder.cpp b/polly/lib/CodeGen/IslNodeBuilder.cpp
--- a/polly/lib/CodeGen/IslNodeBuilder.cpp
+++ b/polly/lib/CodeGen/IslNodeBuilder.cpp
@@ -476,7 +476,7 @@
     IVS[i] = Builder.CreateAdd(IVS[i - 1], ValueInc, "p_vector_iv");
 
   isl::union_map Schedule = getScheduleForAstNode(isl::manage_copy(For));
-  assert(!Schedule.is_null() &&
+  assert(Schedule.get() &&
          "For statement annotation does not contain its schedule");
 
   IDToValue[IteratorID] = ValueLB;