diff --git a/src/rust/lib.rs b/src/rust/lib.rs
index 8849da7..eca5883 100644
--- a/src/rust/lib.rs
+++ b/src/rust/lib.rs
@@ -180,17 +180,17 @@ fn resvg_magic(mut options: Opts, svg_string: String) -> Result<Vec<u8>, String>
     resources_dir = None,
     languages = vec![],
     font_size = 16,
-    font_family = "Times New Roman",
-    serif_family = "Times New Roman",
-    sans_serif_family = "Arial",
-    cursive_family = "Comic Sans MS",
-    fantasy_family = "Impact",
-    monospace_family = "Courier New",
+    font_family = "Times New Roman".to_owned(),
+    serif_family = "Times New Roman".to_owned(),
+    sans_serif_family = "Arial".to_owned(),
+    cursive_family = "Comic Sans MS".to_owned(),
+    fantasy_family = "Impact".to_owned(),
+    monospace_family = "Courier New".to_owned(),
     font_files = None,
     font_dirs = None,
-    shape_rendering = "geometric_precision",
-    text_rendering = "optimize_legibility",
-    image_rendering = "optimize_quality",
+    shape_rendering = "geometric_precision".to_owned(),
+    text_rendering = "optimize_legibility".to_owned(),
+    image_rendering = "optimize_quality".to_owned(),
     ))]
 fn svg_to_bytes(
     svg_string: Option<String>,
@@ -212,18 +212,18 @@ fn svg_to_bytes(
     // Fonts
     languages: Option<Vec<String>>,
     font_size: Option<u32>,
-    font_family: Option<&str>,
-    serif_family: Option<&str>,
-    sans_serif_family: Option<&str>,
-    cursive_family: Option<&str>,
-    fantasy_family: Option<&str>,
-    monospace_family: Option<&str>,
+    font_family: Option<String>,
+    serif_family: Option<String>,
+    sans_serif_family:Option<String>,
+    cursive_family: Option<String>,
+    fantasy_family: Option<String>,
+    monospace_family:Option<String>,
     font_files: Option<Vec<String>>,
     font_dirs: Option<Vec<String>>,
     // Effects based
-    shape_rendering: Option<&str>,
-    text_rendering: Option<&str>,
-    image_rendering: Option<&str>,
+    shape_rendering:Option<String>,
+    text_rendering: Option<String>,
+    image_rendering: Option<String>,
 
 ) -> PyResult<Vec<u8>> {
     if log_information.unwrap_or(false) {
@@ -276,7 +276,7 @@ fn svg_to_bytes(
     }
 
     let _shape_rendering = match shape_rendering
-        .unwrap_or("geometric_precision")
+        .unwrap_or("geometric_precision".to_string())
         .as_ref()
     {
         "optimize_speed" => resvg::usvg::ShapeRendering::OptimizeSpeed,
@@ -286,7 +286,7 @@ fn svg_to_bytes(
     };
 
     let _text_rendering = match text_rendering
-        .unwrap_or("optimize_legibility")
+        .unwrap_or("optimize_legibility".to_string())
         .as_ref()
     {
         "optimize_speed" => resvg::usvg::TextRendering::OptimizeSpeed,
@@ -296,7 +296,7 @@ fn svg_to_bytes(
     };
 
     let _image_rendering = match image_rendering
-        .unwrap_or("optimize_quality")
+        .unwrap_or("optimize_quality".to_string())
         .as_ref()
     {
         "optimize_quality" => resvg::usvg::ImageRendering::OptimizeQuality,
@@ -320,7 +320,7 @@ fn svg_to_bytes(
     let usvg_options = resvg::usvg::Options {
         resources_dir: _resources_dir,
         dpi: dpi.unwrap_or(0) as f32,
-        font_family: font_family.unwrap_or("Times New Roman").to_string(),
+        font_family: font_family.unwrap_or("Times New Roman".to_string()),
         font_size: font_size.unwrap_or(16) as f32,
         languages: languages.unwrap_or(vec![]),
         shape_rendering: _shape_rendering,
@@ -337,11 +337,11 @@ fn svg_to_bytes(
         background: _background,
         skip_system_fonts: skip_system_fonts.unwrap_or(false),
         fit_to,
-        serif_family:serif_family.map(|s|s.to_string()),
-        sans_serif_family:sans_serif_family.map(|s|s.to_string()),
-        cursive_family:cursive_family.map(|s|s.to_string()),
-        fantasy_family:fantasy_family.map(|s|s.to_string()),
-        monospace_family:monospace_family.map(|s|s.to_string()),
+        serif_family:serif_family,
+        sans_serif_family:sans_serif_family,
+        cursive_family:cursive_family,
+        fantasy_family:fantasy_family,
+        monospace_family:monospace_family,
         font_files,
         font_dirs,
     };