diff --git a/sqlx-core/src/pool/inner.rs b/sqlx-core/src/pool/inner.rs
index b698dc9d..7c6a84ad 100644
--- a/sqlx-core/src/pool/inner.rs
+++ b/sqlx-core/src/pool/inner.rs
@@ -11,7 +11,7 @@ use crate::sync::{AsyncSemaphore, AsyncSemaphoreReleaser};
 use std::cmp;
 use std::future::{self, Future};
 use std::pin::pin;
-use std::sync::atomic::{AtomicBool, AtomicU32, AtomicUsize, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use std::sync::{Arc, RwLock};
 use std::task::Poll;
 
@@ -26,7 +26,7 @@ pub(crate) struct PoolInner<DB: Database> {
     pub(super) connect_options: RwLock<Arc<<DB::Connection as Connection>::Options>>,
     pub(super) idle_conns: ArrayQueue<Idle<DB>>,
     pub(super) semaphore: AsyncSemaphore,
-    pub(super) size: AtomicU32,
+    pub(super) size: AtomicUsize,
     pub(super) num_idle: AtomicUsize,
     is_closed: AtomicBool,
     pub(super) on_closed: event_listener::Event,
@@ -55,7 +55,7 @@ impl<DB: Database> PoolInner<DB> {
             connect_options: RwLock::new(Arc::new(connect_options)),
             idle_conns: ArrayQueue::new(capacity),
             semaphore: AsyncSemaphore::new(options.fair, semaphore_capacity),
-            size: AtomicU32::new(0),
+            size: AtomicUsize::new(0),
             num_idle: AtomicUsize::new(0),
             is_closed: AtomicBool::new(false),
             on_closed: event_listener::Event::new(),
@@ -71,7 +71,7 @@ impl<DB: Database> PoolInner<DB> {
         pool
     }
 
-    pub(super) fn size(&self) -> u32 {
+    pub(super) fn size(&self) -> usize {
         self.size.load(Ordering::Acquire)
     }
 
diff --git a/sqlx-core/src/pool/mod.rs b/sqlx-core/src/pool/mod.rs
index f11ff1d7..6e540894 100644
--- a/sqlx-core/src/pool/mod.rs
+++ b/sqlx-core/src/pool/mod.rs
@@ -532,7 +532,7 @@ impl<DB: Database> Pool<DB> {
     }
 
     /// Returns the number of connections currently active. This includes idle connections.
-    pub fn size(&self) -> u32 {
+    pub fn size(&self) -> usize {
         self.0.size()
     }
 
diff --git a/sqlx-core/src/pool/options.rs b/sqlx-core/src/pool/options.rs
index 3d048f17..2c2c2e18 100644
--- a/sqlx-core/src/pool/options.rs
+++ b/sqlx-core/src/pool/options.rs
@@ -74,12 +74,12 @@ pub struct PoolOptions<DB: Database> {
                 + Sync,
         >,
     >,
-    pub(crate) max_connections: u32,
+    pub(crate) max_connections: usize,
     pub(crate) acquire_time_level: LevelFilter,
     pub(crate) acquire_slow_level: LevelFilter,
     pub(crate) acquire_slow_threshold: Duration,
     pub(crate) acquire_timeout: Duration,
-    pub(crate) min_connections: u32,
+    pub(crate) min_connections: usize,
     pub(crate) max_lifetime: Option<Duration>,
     pub(crate) idle_timeout: Option<Duration>,
     pub(crate) fair: bool,
@@ -170,13 +170,13 @@ impl<DB: Database> PoolOptions<DB> {
     /// Be mindful of the connection limits for your database as well as other applications
     /// which may want to connect to the same database (or even multiple instances of the same
     /// application in high-availability deployments).
-    pub fn max_connections(mut self, max: u32) -> Self {
+    pub fn max_connections(mut self, max: usize) -> Self {
         self.max_connections = max;
         self
     }
 
     /// Get the maximum number of connections that this pool should maintain
-    pub fn get_max_connections(&self) -> u32 {
+    pub fn get_max_connections(&self) -> usize {
         self.max_connections
     }
 
@@ -202,13 +202,13 @@ impl<DB: Database> PoolOptions<DB> {
     /// [`max_lifetime`]: Self::max_lifetime
     /// [`idle_timeout`]: Self::idle_timeout
     /// [`max_connections`]: Self::max_connections
-    pub fn min_connections(mut self, min: u32) -> Self {
+    pub fn min_connections(mut self, min: usize) -> Self {
         self.min_connections = min;
         self
     }
 
     /// Get the minimum number of connections to maintain at all times.
-    pub fn get_min_connections(&self) -> u32 {
+    pub fn get_min_connections(&self) -> usize {
         self.min_connections
     }