diff --git a/mate-extra/mate-calc/files/mate-calc-1.28.0-mpc-1.4.patch b/mate-extra/mate-calc/files/mate-calc-1.28.0-mpc-1.4.patch
new file mode 100644
index 0000000000000..b258f0e9f7b57
--- /dev/null
+++ b/mate-extra/mate-calc/files/mate-calc-1.28.0-mpc-1.4.patch
@@ -0,0 +1,29 @@
+https://github.com/mate-desktop/mate-calc/issues/239
+https://github.com/mate-desktop/mate-calc/pull/240
+
+From 220027f5ab946a1ca38f9888fdbe64630106aecc Mon Sep 17 00:00:00 2001
+From: mbkma <johannes.unruh@fau.de>
+Date: Sun, 19 Apr 2026 11:32:51 +0200
+Subject: [PATCH] Set imaginary component to +0*i when inverting a real number
+
+see https://gitlab.gnome.org/GNOME/gnome-calculator/-/merge_requests/457
+---
+ src/mp.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/mp.c b/src/mp.c
+index 31a84d4d..08e7afce 100644
+--- a/src/mp.c
++++ b/src/mp.c
+@@ -398,6 +398,10 @@ void
+ mp_invert_sign(const MPNumber *x, MPNumber *z)
+ {
+     mpc_neg(z->num, x->num, MPC_RNDNN);
++    if (!mp_is_complex(x))
++    {
++        mpfr_set_zero(mpc_imagref(z->num), MPFR_RNDN);
++    }
+ }
+ 
+ void
+
diff --git a/mate-extra/mate-calc/mate-calc-1.28.0-r2.ebuild b/mate-extra/mate-calc/mate-calc-1.28.0-r2.ebuild
new file mode 100644
index 0000000000000..935784df6f0e7
--- /dev/null
+++ b/mate-extra/mate-calc/mate-calc-1.28.0-r2.ebuild
@@ -0,0 +1,40 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit mate
+
+MINOR=$(($(ver_cut 2) % 2))
+if [[ ${MINOR} -eq 0 ]]; then
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~riscv ~x86"
+fi
+
+DESCRIPTION="Calculator for MATE"
+LICENSE="CC-BY-SA-3.0 GPL-2+"
+SLOT="0"
+
+COMMON_DEPEND="
+	>=app-accessibility/at-spi2-core-2.46.0
+	>=dev-libs/glib-2.50:2
+	dev-libs/libxml2:2=
+	dev-libs/mpc:=
+	>=dev-libs/mpfr-4.0.2:=
+	>=x11-libs/gtk+-3.22:3
+	x11-libs/pango
+"
+
+RDEPEND="${COMMON_DEPEND}
+	virtual/libintl
+"
+
+BDEPEND="${COMMON_DEPEND}
+	app-text/yelp-tools
+	dev-libs/libxml2
+	>=sys-devel/gettext-0.19.8
+	virtual/pkgconfig
+"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.28.0-mpc-1.4.patch
+)