diff --git a/www-client/chromium/chromium-102.0.5005.115.ebuild b/www-client/chromium/chromium-102.0.5005.115.ebuild
index 82566d5c82b9b..f6aec029a3819 100644
--- a/www-client/chromium/chromium-102.0.5005.115.ebuild
+++ b/www-client/chromium/chromium-102.0.5005.115.ebuild
@@ -850,6 +850,12 @@ src_configure() {
 		myconf_gn+=" symbol_level=0"
 	fi
 
+	# user CXXFLAGS might overwrite -march=armv8-a+crc+crypto, bug #851639
+	if use arm64 && tc-is-gcc; then
+		sed -i '/^#if HAVE_ARM64_CRC32C/a #pragma GCC target ("+crc+crypto")' \
+			third_party/crc32c/src/src/crc32c_arm64.cc || die
+	fi
+
 	einfo "Configuring Chromium..."
 	set -- gn gen --args="${myconf_gn} ${EXTRA_GN}" out/Release
 	echo "$@"
diff --git a/www-client/chromium/chromium-103.0.5060.53.ebuild b/www-client/chromium/chromium-103.0.5060.53.ebuild
index ffeca13f66fd3..cafad16fc39a0 100644
--- a/www-client/chromium/chromium-103.0.5060.53.ebuild
+++ b/www-client/chromium/chromium-103.0.5060.53.ebuild
@@ -927,6 +927,12 @@ src_configure() {
 		myconf_gn+=" symbol_level=0"
 	fi
 
+	# user CXXFLAGS might overwrite -march=armv8-a+crc+crypto, bug #851639
+	if use arm64 && tc-is-gcc; then
+		sed -i '/^#if HAVE_ARM64_CRC32C/a #pragma GCC target ("+crc+crypto")' \
+			third_party/crc32c/src/src/crc32c_arm64.cc || die
+	fi
+
 	einfo "Configuring Chromium..."
 	set -- gn gen --args="${myconf_gn} ${EXTRA_GN}" out/Release
 	echo "$@"
diff --git a/www-client/chromium/chromium-104.0.5110.0.ebuild b/www-client/chromium/chromium-104.0.5110.0.ebuild
index 64b7e13cd82b7..95391b14d5a17 100644
--- a/www-client/chromium/chromium-104.0.5110.0.ebuild
+++ b/www-client/chromium/chromium-104.0.5110.0.ebuild
@@ -949,6 +949,12 @@ chromium_configure() {
 		myconf_gn+=" chrome_pgo_phase=0"
 	fi
 
+	# user CXXFLAGS might overwrite -march=armv8-a+crc+crypto, bug #851639
+	if use arm64 && tc-is-gcc; then
+		sed -i '/^#if HAVE_ARM64_CRC32C/a #pragma GCC target ("+crc+crypto")' \
+			third_party/crc32c/src/src/crc32c_arm64.cc || die
+	fi
+
 	einfo "Configuring Chromium..."
 	set -- gn gen --args="${myconf_gn} ${EXTRA_GN}" out/Release
 	echo "$@"