diff --git a/ice40/pack.cc b/ice40/pack.cc
index 4de88abd..b1efe5b2 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -858,6 +858,8 @@ static void place_plls(Context *ctx)
             // Find a BEL for it
             BelId found_bel;
             for (auto bel_pll : pll_all_bels) {
+                if (pll_used_bels.count(bel_pll.first))
+                    continue;
                 BelPin pll_io_a, pll_io_b;
                 std::tie(pll_io_a, pll_io_b) = bel_pll.second;
                 if (bel2io.count(pll_io_a.bel)) {
diff --git a/tests b/tests
index fb53a973..0d369eb3 160000
--- a/tests
+++ b/tests
@@ -1 +1 @@
-Subproject commit fb53a97322c32620385af6657596681c0044a32e
+Subproject commit 0d369eb3fe3425fa74c0f6309268a012aac50409