diff --git a/fuzzers/039-hclk-config/top.py b/fuzzers/039-hclk-config/top.py
index 05fce4c7..77b7ad7e 100644
--- a/fuzzers/039-hclk-config/top.py
+++ b/fuzzers/039-hclk-config/top.py
@@ -30,7 +30,9 @@ def gen_sites():
             continue
 
         ioi3 = grid.gridinfo_at_loc((loc.grid_x, loc.grid_y - 1))
-        assert 'IOI3' in ioi3.tile_type
+
+        if 'IOI3' not in ioi3.tile_type:
+            continue
 
         if ioi3.tile_type.startswith('R'):
             dx = 1
diff --git a/fuzzers/Makefile b/fuzzers/Makefile
index 532fa5d1..29c98e8e 100644
--- a/fuzzers/Makefile
+++ b/fuzzers/Makefile
@@ -90,6 +90,7 @@ $(eval $(call fuzzer,035a-iob-idelay,005-tilegrid))
 $(eval $(call fuzzer,036-iob-ologic,005-tilegrid))
 $(eval $(call fuzzer,037-iob-pips,005-tilegrid))
 $(eval $(call fuzzer,038-cfg,005-tilegrid))
+$(eval $(call fuzzer,039-hclk-config,005-tilegrid))
 $(eval $(call fuzzer,040-clk-hrow-config,005-tilegrid))
 $(eval $(call fuzzer,041-clk-hrow-pips,005-tilegrid))
 $(eval $(call fuzzer,042-clk-bufg-config,005-tilegrid))