diff --git a/sqlx-core/src/mariadb/backend.rs b/sqlx-core/src/mariadb/backend.rs
index 84538247..6f13cd4e 100644
--- a/sqlx-core/src/mariadb/backend.rs
+++ b/sqlx-core/src/mariadb/backend.rs
@@ -26,5 +26,5 @@ impl Backend for MariaDb {
     }
 }
 
-impl_from_row_for_backend!(MariaDb);
+impl_from_row_for_backend!(MariaDb, ResultRow);
 impl_into_query_parameters_for_backend!(MariaDb);
diff --git a/sqlx-core/src/mariadb/executor.rs b/sqlx-core/src/mariadb/executor.rs
index 1f798ade..e2946651 100644
--- a/sqlx-core/src/mariadb/executor.rs
+++ b/sqlx-core/src/mariadb/executor.rs
@@ -24,8 +24,6 @@ impl Executor for MariaDb {
         query: &'q str,
         params: MariaDbQueryParameters,
     ) -> BoxFuture<'e, crate::Result<u64>> {
-        let params = params.into_params();
-
         Box::pin(async move {
             let prepare = self.send_prepare(query).await?;
             self.send_execute(prepare.statement_id, params).await?;
@@ -64,16 +62,14 @@ impl Executor for MariaDb {
         })
     }
 
-    fn fetch<'e, 'q: 'e, O: 'e, T: 'e>(
+    fn fetch<'e, 'q: 'e, T: 'e>(
         &'e mut self,
         query: &'q str,
         params: MariaDbQueryParameters,
     ) -> BoxStream<'e, crate::Result<T>>
     where
-        T: FromRow<Self::Backend, O> + Send + Unpin,
+        T: FromRow<Self::Backend> + Send + Unpin,
     {
-        let params = params.into_params();
-
         Box::pin(async_stream::try_stream! {
            let prepare = self.send_prepare(query).await?;
            self.send_execute(prepare.statement_id, params).await?;
@@ -104,16 +100,14 @@ impl Executor for MariaDb {
         })
     }
 
-    fn fetch_optional<'e, 'q: 'e, O: 'e, T: 'e>(
+    fn fetch_optional<'e, 'q: 'e, T: 'e>(
         &'e mut self,
         query: &'q str,
         params: MariaDbQueryParameters,
     ) -> BoxFuture<'e, crate::Result<Option<T>>>
     where
-        T: FromRow<Self::Backend, O> + Send,
+        T: FromRow<Self::Backend> + Send,
     {
-        let params = params.into_params();
-
         Box::pin(async move {
             let prepare = self.send_prepare(query).await?;
             self.send_execute(prepare.statement_id, params).await?;
@@ -148,8 +142,6 @@ impl Executor for MariaDb {
 
     fn describe<'e, 'q: 'e>(
         &'e mut self,
-        query: &'q str,
-    ) -> BoxFuture<'e, crate::Result<Describe<Self::Backend>>> {
-        unimplemented!();
-    }
+        _query: &'q str,
+    ) -> BoxFuture<'e, crate::Result<Describe<Self::Backend>>> { unimplemented!(); }
 }
diff --git a/sqlx-core/src/mariadb/query.rs b/sqlx-core/src/mariadb/query.rs
index 0a798937..109f717f 100644
--- a/sqlx-core/src/mariadb/query.rs
+++ b/sqlx-core/src/mariadb/query.rs
@@ -40,7 +40,7 @@ impl QueryParameters for MariaDbQueryParameters {
         self.null_bitmap.resize(index / 8, 0);
 
         if let IsNull::Yes = value.encode(&mut self.params) {
-            self.null_bitmap[index / 8] &= (1 << index % 8);
+            self.null_bitmap[index / 8] &= 1 << index % 8;
         }
     }
 }
diff --git a/sqlx-core/src/params.rs b/sqlx-core/src/params.rs
index 20f377ae..0a61c5eb 100644
--- a/sqlx-core/src/params.rs
+++ b/sqlx-core/src/params.rs
@@ -27,6 +27,8 @@ macro_rules! impl_into_query_parameters {
             $($T: crate::encode::Encode<$B>,)+
         {
             fn into_params(self) -> <$B as crate::backend::Backend>::QueryParameters {
+                use crate::params::QueryParameters;
+
                 let mut params = <$B as crate::backend::Backend>::QueryParameters::default();
 
                 let binds = 0 $(+ { $idx; 1 } )+;