diff --git a/proxy/src/http/sql_over_http.rs b/proxy/src/http/sql_over_http.rs
index 09642b9a93..c7fd7f6e39 100644
--- a/proxy/src/http/sql_over_http.rs
+++ b/proxy/src/http/sql_over_http.rs
@@ -44,7 +44,6 @@ const MAX_REQUEST_SIZE: u64 = 1024 * 1024; // 1 MB
 
 static RAW_TEXT_OUTPUT: HeaderName = HeaderName::from_static("neon-raw-text-output");
 static ARRAY_MODE: HeaderName = HeaderName::from_static("neon-array-mode");
-static ALLOW_POOL: HeaderName = HeaderName::from_static("neon-pool-opt-in");
 static TXN_ISOLATION_LEVEL: HeaderName = HeaderName::from_static("neon-batch-isolation-level");
 static TXN_READ_ONLY: HeaderName = HeaderName::from_static("neon-batch-read-only");