diff --git a/src/string.rs b/src/string.rs
index 1c76193..907032d 100644
--- a/src/string.rs
+++ b/src/string.rs
@@ -156,7 +156,7 @@ impl<B: crate::backend::HeapStr> Ord for KStringBase<B> {
 impl<B: crate::backend::HeapStr> PartialOrd for KStringBase<B> {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.as_str().partial_cmp(other.as_str())
+        Some(self.cmp(other))
     }
 }
 
diff --git a/src/string_cow.rs b/src/string_cow.rs
index 75a35db..627e5da 100644
--- a/src/string_cow.rs
+++ b/src/string_cow.rs
@@ -204,7 +204,7 @@ impl<'s, B: crate::backend::HeapStr> Ord for KStringCowBase<'s, B> {
 impl<'s, B: crate::backend::HeapStr> PartialOrd for KStringCowBase<'s, B> {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.as_str().partial_cmp(other.as_str())
+        Some(self.cmp(other))
     }
 }
 
diff --git a/src/string_ref.rs b/src/string_ref.rs
index 8683b8a..4e373f0 100644
--- a/src/string_ref.rs
+++ b/src/string_ref.rs
@@ -141,7 +141,7 @@ impl<'s> Ord for KStringRef<'s> {
 impl<'s> PartialOrd for KStringRef<'s> {
     #[inline]
     fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        self.as_str().partial_cmp(other.as_str())
+        Some(self.cmp(other))
     }
 }