diff --git a/polly/lib/Analysis/ScopInfo.cpp b/polly/lib/Analysis/ScopInfo.cpp
--- a/polly/lib/Analysis/ScopInfo.cpp
+++ b/polly/lib/Analysis/ScopInfo.cpp
@@ -195,7 +195,7 @@
     isl::set SLB = S.lower_bound_val(type, dim, V);
 
     V = valFromAPInt(Ctx.get(), Range.getUpper(), true);
-    V = V.sub_ui(1);
+    V = V.sub(1);
     isl::set SUB = S.upper_bound_val(type, dim, V);
     S = SLB.unite(SUB);
   }
diff --git a/polly/lib/External/isl/include/isl/isl-noexceptions.h b/polly/lib/External/isl/include/isl/isl-noexceptions.h
--- a/polly/lib/External/isl/include/isl/isl-noexceptions.h
+++ b/polly/lib/External/isl/include/isl/isl-noexceptions.h
@@ -4801,7 +4801,6 @@
   inline int sgn() const;
   inline isl::val sub(isl::val v2) const;
   inline isl::val sub(long v2) const;
-  inline isl::val sub_ui(unsigned long v2) const;
   inline isl::val_list to_list() const;
   inline isl::val trunc() const;
   static inline isl::val zero(isl::ctx ctx);
@@ -22787,12 +22786,6 @@
   return this->sub(isl::val(ctx(), v2));
 }
 
-isl::val val::sub_ui(unsigned long v2) const
-{
-  auto res = isl_val_sub_ui(copy(), v2);
-  return manage(res);
-}
-
 isl::val_list val::to_list() const
 {
   auto res = isl_val_to_list(copy());
diff --git a/polly/unittests/Isl/IslTest.cpp b/polly/unittests/Isl/IslTest.cpp
--- a/polly/unittests/Isl/IslTest.cpp
+++ b/polly/unittests/Isl/IslTest.cpp
@@ -136,7 +136,7 @@
   {
     APInt APNOne(32, (1ull << 32) - 1, false);
     auto IslNOne = valFromAPInt(IslCtx, APNOne, false);
-    auto IslRef = isl::val(IslCtx, 32).pow2().sub_ui(1);
+    auto IslRef = isl::val(IslCtx, 32).pow2().sub(1);
     EXPECT_EQ(IslNOne, IslRef);
   }
 
@@ -223,7 +223,7 @@
   }
 
   {
-    auto IslNOne = isl::val(IslCtx, 32).pow2().sub_ui(1);
+    auto IslNOne = isl::val(IslCtx, 32).pow2().sub(1);
     auto APNOne = APIntFromVal(IslNOne);
     EXPECT_EQ((1ull << 32) - 1, APNOne);
     EXPECT_EQ(33u, APNOne.getBitWidth());
@@ -232,7 +232,7 @@
   {
     auto IslLargeNum = isl::val(IslCtx, 60);
     IslLargeNum = IslLargeNum.pow2();
-    IslLargeNum = IslLargeNum.sub_ui(1);
+    IslLargeNum = IslLargeNum.sub(1);
     auto APLargeNum = APIntFromVal(IslLargeNum);
     EXPECT_EQ((1ull << 60) - 1, APLargeNum);
     EXPECT_EQ(61u, APLargeNum.getBitWidth());