diff --git a/src/board.rs b/src/board.rs
index d84ba43..186693b 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -116,8 +116,8 @@ impl File {
     }
 
     #[inline]
-    pub fn from_char(c: char) -> Option<Self> {
-        Self::from_ascii(c as u8)
+    pub fn from_char(file: char) -> Option<Self> {
+        u8::try_from(file).ok().and_then(Self::from_ascii)
     }
 
     #[inline]
@@ -188,8 +188,8 @@ impl Rank {
     }
 
     #[inline]
-    pub fn from_char(c: char) -> Option<Self> {
-        Self::from_ascii(c as u8)
+    pub fn from_char(rank: char) -> Option<Self> {
+        u8::try_from(rank).ok().and_then(Self::from_ascii)
     }
 
     #[inline]