diff --git a/fuzzers/044-clk-bufg-pips/Makefile b/fuzzers/044-clk-bufg-pips/Makefile
index 0821b3f1..3d0f42de 100644
--- a/fuzzers/044-clk-bufg-pips/Makefile
+++ b/fuzzers/044-clk-bufg-pips/Makefile
@@ -3,7 +3,7 @@ PIP_TYPE?=clk_bufg
 PIPLIST_TCL=$(FUZDIR)/clk_bufg_pip_list.tcl
 TODO_RE=".*"
 
-MAKETODO_FLAGS=--sides "bot_r,top_r" --pip-type ${PIP_TYPE} --seg-type clk_bufg --re $(TODO_RE)
+MAKETODO_FLAGS=--sides "bot_r,top_r" --pip-type ${PIP_TYPE} --seg-type clk_bufg --re $(TODO_RE) --exclude-re ".*\.CLK_BUFG_(BOT|TOP)_R_CK_MUXED[0-9]+"
 N = 50
 
 # These PIPs all appear to be either a 1 bit solutions.
diff --git a/fuzzers/044-clk-bufg-pips/generate.py b/fuzzers/044-clk-bufg-pips/generate.py
index 58b895a2..0be965f5 100644
--- a/fuzzers/044-clk-bufg-pips/generate.py
+++ b/fuzzers/044-clk-bufg-pips/generate.py
@@ -3,6 +3,7 @@
 from prjxray.segmaker import Segmaker
 import os
 import os.path
+import re
 
 
 def bitfilter(frame, word):
@@ -72,7 +73,11 @@ def main():
                 tiledata[tile]["srcs"].add(dst)
                 tiledata[tile]["dsts"].add(src)
 
-            if pnum == 1 or pdir == 0:
+            muxed_src = re.match(
+                '^CLK_BUFG_(TOP|BOT)_R_CK_MUXED', src) is not None
+
+            if pnum == 1 or pdir == 0 or \
+                muxed_src:
                 ignpip.add((src, dst))
 
     for tile, pips_srcs_dsts in tiledata.items():