diff --git a/srcpkgs/python3-cypari2/patches/python-3.11.patch b/srcpkgs/python3-cypari2/patches/python-3.11.patch
new file mode 100644
index 00000000000..02f4f9fb8ca
--- /dev/null
+++ b/srcpkgs/python3-cypari2/patches/python-3.11.patch
@@ -0,0 +1,28 @@
+--- a/cypari2/convert.pyx
++++ b/cypari2/convert.pyx
+@@ -59,8 +59,7 @@ cdef extern from *:
+     ctypedef struct PyLongObject:
+         digit* ob_digit
+ 
+-    Py_ssize_t* Py_SIZE_PTR "&Py_SIZE"(object)
+-
++    void __Pyx_SET_SIZE(object, Py_ssize_t)
+ 
+ ########################################################################
+ # Conversion PARI -> Python
+@@ -450,13 +449,10 @@ cdef PyLong_FromINT(GEN g):
+         if d:
+             sizedigits_final = i+1
+ 
+-    # Set correct size (use a pointer to hack around Cython's
+-    # non-support for lvalues).
+-    cdef Py_ssize_t* sizeptr = Py_SIZE_PTR(x)
+     if signe(g) > 0:
+-        sizeptr[0] = sizedigits_final
++        __Pyx_SET_SIZE(x, sizedigits_final);
+     else:
+-        sizeptr[0] = -sizedigits_final
++        __Pyx_SET_SIZE(x, -sizedigits_final);
+ 
+     return x
+ 
diff --git a/srcpkgs/python3-cypari2/template b/srcpkgs/python3-cypari2/template
index 18755ec020b..9ded61101e8 100644
--- a/srcpkgs/python3-cypari2/template
+++ b/srcpkgs/python3-cypari2/template
@@ -13,7 +13,9 @@ homepage="https://github.com/sagemath/cypari2"
 distfiles="${PYPI_SITE}/c/cypari2/cypari2-${version}.tar.gz"
 checksum=03cd45edab8716ebbfdb754e65fea72e873c73dc91aec098fe4a01e35324ac7a
 
-do_check() {
-	PYTHONPATH="$(cd build/lib* && pwd)" \
-		make check
+post_extract() {
+	local _f
+	for _f in cypari2/*.pyx; do
+		rm -f ${_f%.pyx}.c
+	done
 }