diff --git a/pkgs/development/php-packages/amqp/default.nix b/pkgs/development/php-packages/amqp/default.nix
index f5395bbefd6c..8b542ff2ff2a 100644
--- a/pkgs/development/php-packages/amqp/default.nix
+++ b/pkgs/development/php-packages/amqp/default.nix
@@ -21,7 +21,7 @@ buildPecl {
 
   buildInputs = [ rabbitmq-c ];
 
-  AMQP_DIR = rabbitmq-c;
+  env.AMQP_DIR = rabbitmq-c;
 
   meta = {
     changelog = "https://github.com/php-amqp/php-amqp/releases/tag/v${version}";