diff --git a/sessions-core/src/session.rs b/sessions-core/src/session.rs
index 14b42f8..21d5653 100644
--- a/sessions-core/src/session.rs
+++ b/sessions-core/src/session.rs
@@ -46,7 +46,7 @@ impl Session {
         match self
             .lock_data()
             .read()
-            .map_err(|e| Error::new(ErrorKind::Other, e.to_string()))?
+            .map_err(into_io_error)?
             .get(key)
             .cloned()
         {
@@ -70,7 +70,7 @@ impl Session {
                 }
                 d.insert(
                     key.into(),
-                    serde_json::to_value(val).map_err(|e| Error::new(ErrorKind::Other, e))?,
+                    serde_json::to_value(val).map_err(into_io_error)?,
                 );
             }
         }
@@ -141,7 +141,7 @@ impl Session {
     pub fn data(&self) -> Result<Data> {
         self.lock_data()
             .read()
-            .map_err(|e| Error::new(ErrorKind::Other, e.to_string()))
+            .map_err(into_io_error)
             .map(|d| d.clone())
     }
 }
@@ -151,3 +151,8 @@ impl fmt::Debug for Session {
         self.state.fmt(f)
     }
 }
+
+#[inline]
+fn into_io_error<E: std::error::Error>(e: E) -> Error {
+    Error::new(ErrorKind::Other, e.to_string())
+}