diff --git a/luna/include/luna/OwnedStringView.h b/luna/include/luna/OwnedStringView.h
index b5ce7622..8a47b597 100644
--- a/luna/include/luna/OwnedStringView.h
+++ b/luna/include/luna/OwnedStringView.h
@@ -22,11 +22,7 @@ class OwnedStringView
         return m_length;
     }
 
-    const char& operator[](usize index) const
-    {
-        expect(index < m_length, "OwnedStringView: index out of range");
-        return m_string[index];
-    }
+    const char& operator[](usize) const;
 
   private:
     char* m_string{nullptr};
diff --git a/luna/src/OwnedStringView.cpp b/luna/src/OwnedStringView.cpp
index 8ac2df4b..80e42fa7 100644
--- a/luna/src/OwnedStringView.cpp
+++ b/luna/src/OwnedStringView.cpp
@@ -33,4 +33,10 @@ Result<OwnedStringView> OwnedStringView::clone() const
     if (!c_str) return err(ENOMEM);
 
     return OwnedStringView{c_str};
+}
+
+const char& OwnedStringView::operator[](usize index) const
+{
+    expect(index < m_length, "index out of range");
+    return m_string[index];
 }
\ No newline at end of file