diff --git a/Cargo.toml b/Cargo.toml
index 56742b6..fbec72b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "oslog"
 description = "A minimal safe wrapper around Apple's Logging system"
 repository = "https://github.com/steven-joruk/oslog"
-version = "0.2.0"
+version = "0.2.1"
 authors = ["Steven Joruk <steven@joruk.com>"]
 edition = "2021"
 license = "MIT"
diff --git a/src/lib.rs b/src/lib.rs
index 6a4ef4d..5014c99 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -39,6 +39,12 @@ impl From<log::Level> for Level {
 
 pub struct OsLog {
     inner: os_log_t,
+    /// These need to remain allocated or system logging code can use
+    /// them after they are freed.
+    #[allow(dead_code)]
+    subsystem: Option<CString>,
+    #[allow(dead_code)]
+    category: Option<CString>,
 }
 
 unsafe impl Send for OsLog {}
@@ -64,7 +70,11 @@ impl OsLog {
 
         assert!(!inner.is_null(), "Unexpected null value from os_log_create");
 
-        Self { inner }
+        Self {
+            inner,
+            subsystem: Some(subsystem),
+            category: Some(category),
+        }
     }
 
     #[inline]
@@ -73,7 +83,11 @@ impl OsLog {
 
         assert!(!inner.is_null(), "Unexpected null value for OS_DEFAULT_LOG");
 
-        Self { inner }
+        Self {
+            inner,
+            subsystem: None,
+            category: None,
+        }
     }
 
     #[inline]