diff --git a/libs/pq_proto/src/lib.rs b/libs/pq_proto/src/lib.rs
index 594d7aff3b..c3e1b40789 100644
--- a/libs/pq_proto/src/lib.rs
+++ b/libs/pq_proto/src/lib.rs
@@ -50,7 +50,6 @@ pub enum FeStartupPacket {
     },
 }
 
-#[derive(Debug)]
 pub struct StartupMessageParams {
     data: String,
     pairs: SmallVec<[Range<u32>; 4]>,
@@ -61,6 +60,12 @@ pub struct StartupMessageParams {
     replication: Option<Range<u32>>,
 }
 
+impl fmt::Debug for StartupMessageParams {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_map().entries(self.iter()).finish()
+    }
+}
+
 impl StartupMessageParams {
     /// Get parameter's value by its name.
     pub fn get(&self, name: &str) -> Option<&str> {