diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88dcb0a78..cf2036239 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@
 ### FIX
 
 - Bug in Apache 2.4.39 (https://bz.apache.org/bugzilla/show_bug.cgi?id=63325) causes 408 timeout after 20 seconds on long file uploads (#342) [David Zuelke]
+- Phalcon 3.4.3 segfaults on latest PHP 7.3.6 [David Zuelke]
 
 ## v156 (2019-05-30)
 
diff --git a/support/build/extensions/no-debug-non-zts-20121212/phalcon b/support/build/extensions/no-debug-non-zts-20121212/phalcon
index 516339290..4c63560a9 100755
--- a/support/build/extensions/no-debug-non-zts-20121212/phalcon
+++ b/support/build/extensions/no-debug-non-zts-20121212/phalcon
@@ -36,6 +36,34 @@ else
 	workdir=php${series:0:1}/64bits
 fi
 pushd ${dep_dirname}
+
+# 3.4.3 requires an updated Zephir with fixes, otherwise PHP 7.3.6+ will segfault: https://github.com/phalcon/cphalcon/issues/14160
+if dpkg --compare-versions "$dep_version" "le" 3.4.3; then
+	# first, install zephir parser...
+	git clone https://github.com/phalcon/php-zephir-parser
+	pushd php-zephir-parser
+	phpize
+	./configure --prefix=${OUT_PREFIX}
+	make -s -j9
+	make install -s
+	# ... and load as extension
+	echo "extension=zephir_parser.so" >> ${OUT_PREFIX}/etc/php/conf.d/zehpir.ini
+	popd
+	# zephir itself...
+	git clone https://github.com/phalcon/zephir
+	pushd zephir
+	git checkout 0.10.x
+	# can just be installed into $(cwd)/bin
+	./install-nosudo
+	popd
+	# this regenerates what we really need: ext/kernel/ with the changes
+	zephir/bin/zephir generate --backend=ZendEngine3
+	# regenerate the build/ dir
+	php build/gen-build.php
+	# generating phalcon without phalcon installed only produces a safe/ build dir, so override it from earlier
+	workdir=php${series:0:1}/safe
+fi
+
 pushd build
 pushd ${workdir}
 export CC="gcc"