diff --git a/support/ext/blackfire b/support/ext/blackfire
index 3f93a6c5..225f87b4 100755
--- a/support/ext/blackfire
+++ b/support/ext/blackfire
@@ -56,7 +56,7 @@ if [[ -n "$BLACKFIRE_SERVER_TOKEN" && -n "$BLACKFIRE_SERVER_ID" ]]; then
 	if [[ -f "${blackfire_bin}" ]]; then
 		touch "${blackfire_socket}"
 		export BLACKFIRE_CONFIG="/dev/null"
-		export BLACKFIRE_SOCKET="unix://${blackfire_socket}"
+		export BLACKFIRE_AGENT_SOCKET="unix://${blackfire_socket}"
 
 		"${blackfire_bin}" agent:start &
 	else
@@ -68,4 +68,4 @@ EOF
 mkdir --parents "${PREFIX}/etc/php/conf.d"
 cat > "${PREFIX}/etc/conf.d/blackfire.ini" <<'EOF'
 extension = blackfire.so
-EOF
\ No newline at end of file
+EOF