diff --git a/packages/toolchain/math/cloog/build b/packages/toolchain/math/cloog/build
index fe467156b5..fd1205faa0 100755
--- a/packages/toolchain/math/cloog/build
+++ b/packages/toolchain/math/cloog/build
@@ -34,8 +34,7 @@ mkdir -p objdir-host && cd objdir-host
              --disable-static \
              --disable-silent-rules \
              --with-gnu-ld \
-             --with-isl=system \
-             --with-isl-prefix="$ROOT/$TOOLCHAIN" \
+             --with-isl=buildin \
              --with-gmp=system \
              --with-gmp-prefix="$ROOT/$TOOLCHAIN" \