diff --git a/dev-libs/libgit2/libgit2-1.7.2.ebuild b/dev-libs/libgit2/libgit2-1.7.2.ebuild
index e6996dbfbafa7..ae566db5ba70c 100644
--- a/dev-libs/libgit2/libgit2-1.7.2.ebuild
+++ b/dev-libs/libgit2/libgit2-1.7.2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -36,6 +36,13 @@ BDEPEND="
 	virtual/pkgconfig
 "
 
+src_prepare() {
+	cmake_src_prepare
+
+	# https://bugs.gentoo.org/948941
+	sed -i -e 's:-Werror::' tests/headertest/CMakeLists.txt || die
+}
+
 src_configure() {
 	local mycmakeargs=(
 		-DBUILD_TESTS=$(usex test)
diff --git a/dev-libs/libgit2/libgit2-1.8.4.ebuild b/dev-libs/libgit2/libgit2-1.8.4.ebuild
index 3a6f702284080..12157518741c4 100644
--- a/dev-libs/libgit2/libgit2-1.8.4.ebuild
+++ b/dev-libs/libgit2/libgit2-1.8.4.ebuild
@@ -36,6 +36,13 @@ BDEPEND="
 	virtual/pkgconfig
 "
 
+src_prepare() {
+	cmake_src_prepare
+
+	# https://bugs.gentoo.org/948941
+	sed -i -e 's:-Werror::' tests/headertest/CMakeLists.txt || die
+}
+
 src_configure() {
 	local mycmakeargs=(
 		-DBUILD_TESTS=$(usex test)
diff --git a/dev-libs/libgit2/libgit2-1.9.0.ebuild b/dev-libs/libgit2/libgit2-1.9.0.ebuild
index 1f458761528fb..f28cf27e10de6 100644
--- a/dev-libs/libgit2/libgit2-1.9.0.ebuild
+++ b/dev-libs/libgit2/libgit2-1.9.0.ebuild
@@ -36,6 +36,13 @@ BDEPEND="
 	virtual/pkgconfig
 "
 
+src_prepare() {
+	cmake_src_prepare
+
+	# https://bugs.gentoo.org/948941
+	sed -i -e 's:-Werror::' tests/headertest/CMakeLists.txt || die
+}
+
 src_configure() {
 	local mycmakeargs=(
 		-DBUILD_TESTS=$(usex test)