diff --git a/fuzzers/050-pip-seed/Makefile b/fuzzers/050-pip-seed/Makefile
index 72de3993..d45fef45 100644
--- a/fuzzers/050-pip-seed/Makefile
+++ b/fuzzers/050-pip-seed/Makefile
@@ -10,6 +10,7 @@ endif
 # Driven by int_loop.sh
 ITER := 1
 MAKETODO_FLAGS=--re ".*" --not-endswith ".VCC_WIRE"
+PIPLIST_TCL=$(XRAY_FUZZERS_DIR)/piplist/piplist.tcl
 # See int_loop_check.py
 # Original did 200 specimins open loop
 CHECK_ARGS := --max-iters 12 --stable-iters 2
@@ -63,12 +64,13 @@ $(SPECIMENS_OK): build/todo.txt
 	bash generate.sh $(subst /OK,,$@)
 	touch $@
 
-build/pips_int_l.txt: $(XRAY_DIR)/fuzzers/piplist.tcl
-	mkdir -p build/$(ITER)
-	cd build && ${XRAY_VIVADO} -mode batch -source $(XRAY_DIR)/fuzzers/piplist.tcl
+$(XRAY_FUZZERS_DIR)/piplist/build/pips_int_l.txt: $(XRAY_FUZZERS_DIR)/piplist/piplist.tcl
+	mkdir -p $(XRAY_FUZZERS_DIR)/piplist/build
+	cd $(XRAY_FUZZERS_DIR)/piplist/build && ${XRAY_VIVADO} -mode batch -source $(PIPLIST_TCL)
 
-build/todo.txt: build/pips_int_l.txt $(XRAY_DIR)/fuzzers/int_maketodo.py
-# Doesn't pushdb until very end. Compare against db so far
+build/todo.txt: $(XRAY_FUZZERS_DIR)/piplist/build/pips_int_l.txt $(XRAY_DIR)/fuzzers/int_maketodo.py
+	# Doesn't pushdb until very end. Compare against db so far
+	mkdir -p build/$(ITER)
 	python3 $(XRAY_DIR)/fuzzers/int_maketodo.py --db-dir build $(MAKETODO_FLAGS) |sort >build/todo_all.txt
 	cat build/todo_all.txt | sort -R > build/todo.txt.tmp
 	mv build/todo.txt.tmp build/todo.txt
@@ -92,5 +94,8 @@ clean:
 cleaniter:
 	rm -rf build/$(ITER) build/todo.txt
 
-.PHONY: database pushdb run clean cleaniter
+# Remove piplist build files in piplist directory
+cleanpiplist:
+	rm -rf $(XRAY_FUZZERS_DIR)/piplist/build
 
+.PHONY: database pushdb run clean cleaniter cleanpiplist
diff --git a/fuzzers/057-pip-bi/bipiplist.tcl b/fuzzers/057-pip-bi/bipiplist.tcl
index fff2381f..bfd3d478 100644
--- a/fuzzers/057-pip-bi/bipiplist.tcl
+++ b/fuzzers/057-pip-bi/bipiplist.tcl
@@ -1,6 +1,6 @@
 create_project -force -part $::env(XRAY_PART) bipiplist bipiplist
 
-read_verilog $::env(XRAY_DIR)/fuzzers/piplist.v
+read_verilog $::env(XRAY_FUZZERS_DIR)/piplist/piplist.v
 synth_design -top top
 
 set_property -dict "PACKAGE_PIN $::env(XRAY_PIN_00) IOSTANDARD LVCMOS33" [get_ports i]
diff --git a/fuzzers/int_loop.mk b/fuzzers/int_loop.mk
index 3f5056f0..69084b68 100644
--- a/fuzzers/int_loop.mk
+++ b/fuzzers/int_loop.mk
@@ -14,7 +14,7 @@ endif
 ITER ?= 1
 MAKETODO_FLAGS ?=
 PIP_TYPE?=pips_int
-PIPLIST_TCL?=$(XRAY_DIR)/fuzzers/piplist.tcl
+PIPLIST_TCL?=$(XRAY_FUZZERS_DIR)/piplist/piplist.tcl
 
 # See int_loop_check.py
 # rempips took 35 iters once, so set 50 as a good start point
@@ -61,12 +61,12 @@ $(SPECIMENS_OK): build/todo.txt
 	bash ${XRAY_DIR}/utils/top_generate.sh $(subst /OK,,$@)
 	touch $@
 
-build/$(PIP_TYPE)_l.txt: $(XRAY_DIR)/fuzzers/piplist.tcl
-	mkdir -p build/$(ITER)
-	cd build && ${XRAY_VIVADO} -mode batch -source $(PIPLIST_TCL)
+$(XRAY_FUZZERS_DIR)/piplist/build/$(PIP_TYPE)_l.txt: $(PIPLIST_TCL)
+	mkdir -p $(XRAY_FUZZERS_DIR)/piplist/build
+	cd $(XRAY_FUZZERS_DIR)/piplist/build && ${XRAY_VIVADO} -mode batch -source $(PIPLIST_TCL)
 
 # Used 1) to see if we are done 2) pips to try in generate.tcl
-build/todo.txt: build/$(PIP_TYPE)_l.txt $(XRAY_DIR)/fuzzers/int_maketodo.py build/database/seeded
+build/todo.txt: $(XRAY_FUZZERS_DIR)/piplist/build/$(PIP_TYPE)_l.txt $(XRAY_DIR)/fuzzers/int_maketodo.py build/database/seeded
 	XRAY_DATABASE_DIR=${FUZDIR}/build/database python3 $(XRAY_DIR)/fuzzers/int_maketodo.py --pip-type $(PIP_TYPE) $(MAKETODO_FLAGS) |sort >build/todo_all.txt
 	cat build/todo_all.txt | sort -R | head -n$(TODO_N) > build/todo.txt.tmp
 	mv build/todo.txt.tmp build/todo.txt
@@ -97,5 +97,8 @@ clean:
 cleaniter:
 	rm -rf build/$(ITER) build/todo.txt
 
-.PHONY: database pushdb run clean cleaniter
+cleanpiplist:
+	rm -rf $(XRAY_FUZZERS_DIR)/piplist/build
+
+.PHONY: database pushdb run clean cleaniter cleanpiplist
 
diff --git a/fuzzers/int_maketodo.py b/fuzzers/int_maketodo.py
index 6916c55c..7e1e31b1 100644
--- a/fuzzers/int_maketodo.py
+++ b/fuzzers/int_maketodo.py
@@ -85,20 +85,30 @@ def maketodo(pipfile, dbfile, intre, not_endswith=None, verbose=False):
     verbose and print('Print %u entries w/ %u drops' % (lines, drops))
 
 
-def run(build_dir, db_dir, intre, pip_type, not_endswith=None, verbose=False):
+def run(
+        build_dir,
+        db_dir,
+        pip_dir,
+        intre,
+        pip_type,
+        not_endswith=None,
+        verbose=False):
     if db_dir is None:
         db_dir = "%s/%s" % (
             os.getenv("XRAY_DATABASE_DIR"), os.getenv("XRAY_DATABASE"))
 
+    if pip_dir is None:
+        pip_dir = "%s/piplist/build" % (os.getenv("XRAY_FUZZERS_DIR"))
+
     assert intre, "RE is required"
     maketodo(
-        "%s/%s_l.txt" % (build_dir, pip_type),
+        "%s/%s_l.txt" % (pip_dir, pip_type),
         "%s/segbits_int_l.db" % db_dir,
         intre,
         not_endswith,
         verbose=verbose)
     maketodo(
-        "%s/%s_r.txt" % (build_dir, pip_type),
+        "%s/%s_r.txt" % (pip_dir, pip_type),
         "%s/segbits_int_r.db" % db_dir,
         intre,
         not_endswith,
@@ -114,6 +124,7 @@ def main():
     parser.add_argument('--verbose', action='store_true', help='')
     parser.add_argument('--build-dir', default="build", help='')
     parser.add_argument('--db-dir', default=None, help='')
+    parser.add_argument('--pip-dir', default=None, help='')
     parser.add_argument('--re', required=True, help='')
     parser.add_argument('--pip-type', default="pips_int", help='')
     parser.add_argument(
@@ -123,6 +134,7 @@ def main():
     run(
         build_dir=args.build_dir,
         db_dir=args.db_dir,
+        pip_dir=args.pip_dir,
         intre=args.re,
         pip_type=args.pip_type,
         not_endswith=args.not_endswith,
diff --git a/fuzzers/piplist.tcl b/fuzzers/piplist/piplist.tcl
similarity index 96%
rename from fuzzers/piplist.tcl
rename to fuzzers/piplist/piplist.tcl
index f8398cce..70f67ba1 100644
--- a/fuzzers/piplist.tcl
+++ b/fuzzers/piplist/piplist.tcl
@@ -3,7 +3,7 @@ source "$::env(XRAY_DIR)/utils/utils.tcl"
 proc build_project {} {
     create_project -force -part $::env(XRAY_PART) piplist piplist
 
-    read_verilog $::env(XRAY_DIR)/fuzzers/piplist.v
+    read_verilog $::env(XRAY_FUZZERS_DIR)/piplist/piplist.v
     synth_design -top top
 
     set_property -dict "PACKAGE_PIN $::env(XRAY_PIN_00) IOSTANDARD LVCMOS33" [get_ports i]
diff --git a/fuzzers/piplist.v b/fuzzers/piplist/piplist.v
similarity index 100%
rename from fuzzers/piplist.v
rename to fuzzers/piplist/piplist.v
diff --git a/utils/environment.sh b/utils/environment.sh
index 5b0c18c6..8ccfb715 100644
--- a/utils/environment.sh
+++ b/utils/environment.sh
@@ -9,6 +9,7 @@ export XRAY_UTILS_DIR="$( cd -P "$( dirname "$XRAY_ENV_PATH" )" && pwd )"
 export XRAY_DIR="$( dirname "$XRAY_UTILS_DIR" )"
 export XRAY_DATABASE_DIR="${XRAY_DIR}/database"
 export XRAY_TOOLS_DIR="${XRAY_DIR}/build/tools"
+export XRAY_FUZZERS_DIR="${XRAY_DIR}/fuzzers"
 
 if [ -e "${XRAY_DIR}/env/bin/activate" ]; then
   source "${XRAY_DIR}/env/bin/activate"