diff --git a/Makefile b/Makefile
index 6e050c715..db48e83f5 100644
--- a/Makefile
+++ b/Makefile
@@ -106,14 +106,14 @@ test-p:
 .PHONY: valgrind
 valgrind:
 	python3 -c "import pytest_valgrind" > /dev/null 2>&1 || python3 -m pip install pytest-valgrind
-	PILLOW_VALGRIND_TEST=true PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss-fuzz/python.supp --leak-check=no \
+	PILLOW_VALGRIND_TEST=true PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss_fuzz/python.supp --leak-check=no \
             --log-file=/tmp/valgrind-output \
             python3 -m pytest --no-memcheck -vv --valgrind --valgrind-log=/tmp/valgrind-output
 
 .PHONY: valgrind-leak
 valgrind-leak:
 	python3 -c "import pytest_valgrind" > /dev/null 2>&1 || python3 -m pip install pytest-valgrind
-	PILLOW_VALGRIND_TEST=true PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss-fuzz/python.supp \
+	PILLOW_VALGRIND_TEST=true PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss_fuzz/python.supp \
 	    --leak-check=full --show-leak-kinds=definite --errors-for-leak-kinds=definite \
             --log-file=/tmp/valgrind-output \
             python3 -m pytest -vv --valgrind --valgrind-log=/tmp/valgrind-output
diff --git a/Tests/oss-fuzz/build.sh b/Tests/oss_fuzz/build.sh
similarity index 100%
rename from Tests/oss-fuzz/build.sh
rename to Tests/oss_fuzz/build.sh
diff --git a/Tests/oss-fuzz/build_dictionaries.sh b/Tests/oss_fuzz/build_dictionaries.sh
similarity index 100%
rename from Tests/oss-fuzz/build_dictionaries.sh
rename to Tests/oss_fuzz/build_dictionaries.sh
diff --git a/Tests/oss-fuzz/fuzz_font.py b/Tests/oss_fuzz/fuzz_font.py
similarity index 100%
rename from Tests/oss-fuzz/fuzz_font.py
rename to Tests/oss_fuzz/fuzz_font.py
diff --git a/Tests/oss-fuzz/fuzz_pillow.py b/Tests/oss_fuzz/fuzz_pillow.py
similarity index 100%
rename from Tests/oss-fuzz/fuzz_pillow.py
rename to Tests/oss_fuzz/fuzz_pillow.py
diff --git a/Tests/oss-fuzz/fuzzers.py b/Tests/oss_fuzz/fuzzers.py
similarity index 100%
rename from Tests/oss-fuzz/fuzzers.py
rename to Tests/oss_fuzz/fuzzers.py
diff --git a/Tests/oss-fuzz/python.supp b/Tests/oss_fuzz/python.supp
similarity index 100%
rename from Tests/oss-fuzz/python.supp
rename to Tests/oss_fuzz/python.supp
diff --git a/Tests/oss-fuzz/test_fuzzers.py b/Tests/oss_fuzz/test_fuzzers.py
similarity index 100%
rename from Tests/oss-fuzz/test_fuzzers.py
rename to Tests/oss_fuzz/test_fuzzers.py
diff --git a/pyproject.toml b/pyproject.toml
index 137726a1c..8b7a7324c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -188,10 +188,10 @@ lint.ignore = [
   "PYI034", # flake8-pyi: typing.Self added in Python 3.11
   "UP038",  # pyupgrade: deprecated rule
 ]
-lint.per-file-ignores."Tests/oss-fuzz/fuzz_font.py" = [
+lint.per-file-ignores."Tests/oss_fuzz/fuzz_font.py" = [
   "I002",
 ]
-lint.per-file-ignores."Tests/oss-fuzz/fuzz_pillow.py" = [
+lint.per-file-ignores."Tests/oss_fuzz/fuzz_pillow.py" = [
   "I002",
 ]
 lint.flake8-pytest-style.parametrize-names-type = "csv"