diff --git a/fuzzers/035b-iob-iserdes/bits.dbf b/fuzzers/035b-iob-iserdes/bits.dbf
index 1de30d70..7a400432 100644
--- a/fuzzers/035b-iob-iserdes/bits.dbf
+++ b/fuzzers/035b-iob-iserdes/bits.dbf
@@ -2,5 +2,5 @@
 26_99 27_98 ,IOB_Y0.IFF.DDR_CLK_EDGE.SAME_EDGE
 26_29 27_28 ,IOB_Y1.IFF.DDR_CLK_EDGE.OPPOSITE_EDGE
 26_29 27_28 ,IOB_Y1.IFF.DDR_CLK_EDGE.SAME_EDGE
-26_101 26_107 26_109 26_111 26_115 26_117 26_121 27_108 27_110 27_112 28_126 29_123 29_125
-26_15 26_17 26_19 27_6 27_10 27_12 27_16 27_18 27_20 27_26 28_2 28_4 29_1
+26_101 26_107 26_109 26_111 26_115 26_117 26_121 27_108 27_110 27_112
+26_15 26_17 26_19 27_6 27_10 27_12 27_16 27_18 27_20 27_26
diff --git a/fuzzers/035b-iob-iserdes/generate.tcl b/fuzzers/035b-iob-iserdes/generate.tcl
index d29f3064..c5751862 100644
--- a/fuzzers/035b-iob-iserdes/generate.tcl
+++ b/fuzzers/035b-iob-iserdes/generate.tcl
@@ -18,6 +18,7 @@ set_property IS_ENABLED 0 [get_drc_checks {REQP-111}]
 set_property IS_ENABLED 0 [get_drc_checks {REQP-103}]
 set_property IS_ENABLED 0 [get_drc_checks {REQP-79}]
 set_property IS_ENABLED 0 [get_drc_checks {PDRC-26}]
+set_property IS_ENABLED 0 [get_drc_checks {REQP-105}]
 
 place_design
 route_design
diff --git a/fuzzers/035b-iob-iserdes/top.py b/fuzzers/035b-iob-iserdes/top.py
index 691d3f0f..ffe962ef 100644
--- a/fuzzers/035b-iob-iserdes/top.py
+++ b/fuzzers/035b-iob-iserdes/top.py
@@ -226,10 +226,12 @@ IDELAYCTRL idelayctrl();
             print('(* LOC="%s", KEEP, DONT_TOUCH *)' % other_sites["IOB"])
             print('OBUF obuf_%03d (.I(do_buf[%3d]), .O(do[%3d]));' % (i, i, i))
 
+            clk1_conn = random.choice(["clk1", ""])
+
             param_str = ",".join(".%s(%s)" % (k, v) for k, v in params.items())
             print(
-                'ilogic_single #(%s) ilogic_%03d (.clk1(clk1), .clk2(clk2), .ce(ce), .rst(rst), .I(di_buf[%3d]), .O(do_buf[%3d]));'
-                % (param_str, i, i, i))
+                'ilogic_single #(%s) ilogic_%03d (.clk1(%s), .clk2(clk2), .ce(ce), .rst(rst), .I(di_buf[%3d]), .O(do_buf[%3d]));'
+                % (param_str, i, clk1_conn, i, i))
 
             params["CHAINED"] = 0
             params["TILE_NAME"] = tile_name