diff --git a/pkgs/development/php-packages/datadog_trace/default.nix b/pkgs/development/php-packages/datadog_trace/default.nix
index 9b91d85fefe5..38beba92e21e 100644
--- a/pkgs/development/php-packages/datadog_trace/default.nix
+++ b/pkgs/development/php-packages/datadog_trace/default.nix
@@ -7,7 +7,7 @@ buildPecl rec {
   src = fetchFromGitHub {
     owner = "DataDog";
     repo = "dd-trace-php";
-    rev = "${version}";
+    rev = version;
     sha256 = "sha256-AYRBzE0Detg/IHXYutZUfPRMtfthxdkSjqD0M+VcTpY=";
   };