diff --git a/openpgp-card/src/lib.rs b/openpgp-card/src/lib.rs
index 3e9931a..022c9fd 100644
--- a/openpgp-card/src/lib.rs
+++ b/openpgp-card/src/lib.rs
@@ -84,31 +84,25 @@ pub type CardClientBox = Box<dyn CardClient + Send + Sync>;
 #[derive(Clone, Copy, Debug)]
 pub struct CardCaps {
     /// Extended Lc and Le fields
-    pub ext_support: bool,
+    ext_support: bool,
 
     /// Command chaining
-    pub chaining_support: bool,
+    chaining_support: bool,
 
     /// Maximum number of bytes in a command APDU
-    pub max_cmd_bytes: u16,
+    max_cmd_bytes: u16,
 
     /// Maximum number of bytes in a response APDU
-    pub max_rsp_bytes: u16,
+    max_rsp_bytes: u16,
 }
 
 impl CardCaps {
-    pub fn new(
-        ext_support: bool,
-        chaining_support: bool,
-        max_cmd_bytes: u16,
-        max_rsp_bytes: u16,
-    ) -> CardCaps {
-        Self {
-            ext_support,
-            chaining_support,
-            max_cmd_bytes,
-            max_rsp_bytes,
-        }
+    pub fn get_ext_support(&self) -> bool {
+        self.ext_support
+    }
+
+    pub fn get_max_rsp_bytes(&self) -> u16 {
+        self.max_rsp_bytes
     }
 }
 
diff --git a/scdc/src/lib.rs b/scdc/src/lib.rs
index 89bf592..53d26b8 100644
--- a/scdc/src/lib.rs
+++ b/scdc/src/lib.rs
@@ -197,9 +197,9 @@ impl CardClient for ScdClient {
         let hex = hex::encode(cmd);
 
         let ext = if self.card_caps.is_some()
-            && self.card_caps.unwrap().ext_support
+            && self.card_caps.unwrap().get_ext_support()
         {
-            format!("--exlen={} ", self.card_caps.unwrap().max_rsp_bytes)
+            format!("--exlen={} ", self.card_caps.unwrap().get_max_rsp_bytes())
         } else {
             "".to_string()
         };