diff --git a/pyproject.toml b/pyproject.toml
index 9322091..013223e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,6 +5,9 @@ build-backend = 'setuptools.build_meta'
 [tool.cibuildwheel]
 test-command = 'pytest {package}/tests'
 test-extras = ['tests']
+# There seems to be a problem compiling NumPy for testing due to a missing
+# constant definition for s390x builds. Skipping for now.
+test-skip = "*-musllinux_s390x"
 
 [tool.cibuildwheel.linux]
 archs = ['auto', 'aarch64', 'ppc64le', 's390x']
@@ -19,6 +22,11 @@ before-test = "brew install libsndfile"
 #archs = ['auto', 'ARM64']
 
 [[tool.cibuildwheel.overrides]]
+# There is a known issue with buildroot/musl images not detecting libraries
+# correctly. Python's ctypes library is affected by this, which is needed by
+# python-soundfile to use libsndfile. This hack is to get around this issue to
+# be able to test on musllinux successfully.
+# See https://github.com/bastibe/python-soundfile/issues/258
 select = '*-musllinux*'
 before-test = [
     'apk add libsndfile',