diff --git a/support/ext/blackfire b/support/ext/blackfire
index 132c8f8d..f90e7ff5 100755
--- a/support/ext/blackfire
+++ b/support/ext/blackfire
@@ -49,11 +49,16 @@ echo -e "[blackfire]\nserver-id=f1abf3a8-3f85-4743-99b2-97f066c099b9\nserver-tok
 find ${PREFIX} -type f \( -executable -o -name '*.a' \) -exec sh -c "file -i '{}' | grep -Eq 'application/x-(archive|executable|sharedlib); charset=binary'" \; -print | xargs strip --strip-unneeded
 
 # gets sourced on container boot
+blackfire_bin="/app/vendor/php/bin/blackfire"
+blackfire_socket="/app/vendor/php/var/blackfire/run/agent.sock"
 cat > "${PREFIX}/bin/profile.blackfire.sh" <<'EOF'
 if [[ -n "$BLACKFIRE_SERVER_TOKEN" && -n "$BLACKFIRE_SERVER_ID" ]]; then
-	if [[ -f "/app/vendor/php/bin/blackfire-agent" ]]; then
-		touch /app/vendor/php/var/blackfire/run/agent.sock
-		/app/vendor/php/bin/blackfire-agent -config=/app/vendor/php/etc/blackfire/agent.ini -socket="unix:///app/vendor/php/var/blackfire/run/agent.sock" &
+	if [[ -f "${blackfire_bin}" ]]; then
+		touch "${blackfire_socket}"
+		export BLACKFIRE_CONFIG="/dev/null"
+		export BLACKFIRE_SOCKET="unix://${blackfire_socket}"
+
+		"${blackfire_bin}" agent:start &
 	else
 		echo >&2 "WARNING: Add-on 'blackfire' detected, but PHP extension not yet installed. Push an update to the application to finish installation of the add-on; an empty change ('git commit --allow-empty') is sufficient."
 	fi
@@ -63,8 +68,4 @@ EOF
 mkdir --parents "${PREFIX}/etc/php/conf.d"
 cat > "${PREFIX}/etc/conf.d/blackfire.ini" <<'EOF'
 extension = blackfire.so
-
-blackfire.server_token = ${BLACKFIRE_SERVER_TOKEN}
-blackfire.server_id = ${BLACKFIRE_SERVER_ID}
-blackfire.agent_socket = "unix:///app/vendor/php/var/blackfire/run/agent.sock"
-EOF
+EOF
\ No newline at end of file