diff --git a/src/alphabets.rs b/src/alphabets.rs
index 8f041d3..10dfdc0 100644
--- a/src/alphabets.rs
+++ b/src/alphabets.rs
@@ -60,6 +60,8 @@ impl<'a> Alphabet<'a> {
 pub fn get_alphabet(alphabet_name: &str) -> Alphabet {
   let alphabets: HashMap<&str, &str> = ALPHABETS.iter().cloned().collect();
 
+  alphabets.get(alphabet_name).expect(format!("Unknown alphabet: {}", alphabet_name).as_str()); // FIXME
+
   Alphabet::new(alphabets[alphabet_name])
 }
 
diff --git a/src/colors.rs b/src/colors.rs
index 0713d1d..4424db2 100644
--- a/src/colors.rs
+++ b/src/colors.rs
@@ -16,6 +16,8 @@ const COLORS: [(&'static str, Color); 9] = [
 pub fn get_color(color_name: &str) -> Color {
   let available_colors: HashMap<&str, Color> = COLORS.iter().cloned().collect();
 
+  available_colors.get(color_name).expect(format!("Unknown color: {}", color_name).as_str()); // FIXME
+
   available_colors[&color_name]
 }