diff --git a/glyphs-reader/src/font.rs b/glyphs-reader/src/font.rs
index 53b226fa..9e9082dd 100644
--- a/glyphs-reader/src/font.rs
+++ b/glyphs-reader/src/font.rs
@@ -1919,23 +1919,24 @@ fn get_glyph_category(name: &str, codepoints: &BTreeSet<u32>) -> Option<(Categor
 // https://github.com/googlefonts/glyphsLib/blob/24b4d340e4c82948ba121dcfe563c1450a8e69c9/Lib/glyphsLib/builder/constants.py#L186
 #[rustfmt::skip]
 static GLYPHS_TO_OPENTYPE_LANGUAGE_ID: &[(&str, i32)] = &[
-    ("dflt", 0x0409), ("AFK", 0x0436), ("ARA", 0x0C01), ("ASM", 0x044D), ("AZE", 0x042C),
-    ("BEL", 0x0423), ("BEN", 0x0845), ("BGR", 0x0402), ("BRE", 0x047E), ("CAT", 0x0403),
-    ("CSY", 0x0405), ("DAN", 0x0406), ("DEU", 0x0407), ("ELL", 0x0408), ("ENG", 0x0409),
-    ("ESP", 0x0C0A), ("ETI", 0x0425), ("EUQ", 0x042D), ("FIN", 0x040B), ("FLE", 0x0813),
-    ("FOS", 0x0438), ("FRA", 0x040C), ("FRI", 0x0462), ("GRN", 0x046F), ("GUJ", 0x0447),
-    ("HAU", 0x0468), ("HIN", 0x0439), ("HRV", 0x041A), ("HUN", 0x040E), ("HVE", 0x042B),
-    ("IRI", 0x083C), ("ISL", 0x040F), ("ITA", 0x0410), ("IWR", 0x040D), ("JPN", 0x0411),
-    ("KAN", 0x044B), ("KAT", 0x0437), ("KAZ", 0x043F), ("KHM", 0x0453), ("KOK", 0x0457),
-    ("LAO", 0x0454), ("LSB", 0x082E), ("LTH", 0x0427), ("LVI", 0x0426), ("MAR", 0x044E),
-    ("MKD", 0x042F), ("MLR", 0x044C), ("MLY", 0x043E), ("MNG", 0x0352), ("MTS", 0x043A),
-    ("NEP", 0x0461), ("NLD", 0x0413), ("NOB", 0x0414), ("ORI", 0x0448), ("PAN", 0x0446),
-    ("PAS", 0x0463), ("PLK", 0x0415), ("PTG", 0x0816), ("PTG-BR", 0x0416), ("RMS", 0x0417),
-    ("ROM", 0x0418), ("RUS", 0x0419), ("SAN", 0x044F), ("SKY", 0x041B), ("SLV", 0x0424),
-    ("SQI", 0x041C), ("SRB", 0x081A), ("SVE", 0x041D), ("TAM", 0x0449), ("TAT", 0x0444),
-    ("TEL", 0x044A), ("THA", 0x041E), ("TIB", 0x0451), ("TRK", 0x041F), ("UKR", 0x0422),
-    ("URD", 0x0420), ("USB", 0x042E), ("UYG", 0x0480), ("UZB", 0x0443), ("VIT", 0x042A),
-    ("WEL", 0x0452), ("ZHH", 0x0C04), ("ZHS", 0x0804), ("ZHT", 0x0404),
+    ("AFK", 0x0436), ("ARA", 0x0C01), ("ASM", 0x044D), ("AZE", 0x042C), ("BEL", 0x0423),
+    ("BEN", 0x0845), ("BGR", 0x0402), ("BRE", 0x047E), ("CAT", 0x0403), ("CSY", 0x0405),
+    ("DAN", 0x0406), ("DEU", 0x0407), ("ELL", 0x0408), ("ENG", 0x0409), ("ESP", 0x0C0A),
+    ("ETI", 0x0425), ("EUQ", 0x042D), ("FIN", 0x040B), ("FLE", 0x0813), ("FOS", 0x0438),
+    ("FRA", 0x040C), ("FRI", 0x0462), ("GRN", 0x046F), ("GUJ", 0x0447), ("HAU", 0x0468),
+    ("HIN", 0x0439), ("HRV", 0x041A), ("HUN", 0x040E), ("HVE", 0x042B), ("IRI", 0x083C),
+    ("ISL", 0x040F), ("ITA", 0x0410), ("IWR", 0x040D), ("JPN", 0x0411), ("KAN", 0x044B),
+    ("KAT", 0x0437), ("KAZ", 0x043F), ("KHM", 0x0453), ("KOK", 0x0457), ("LAO", 0x0454),
+    ("LSB", 0x082E), ("LTH", 0x0427), ("LVI", 0x0426), ("MAR", 0x044E), ("MKD", 0x042F),
+    ("MLR", 0x044C), ("MLY", 0x043E), ("MNG", 0x0352), ("MTS", 0x043A), ("NEP", 0x0461),
+    ("NLD", 0x0413), ("NOB", 0x0414), ("ORI", 0x0448), ("PAN", 0x0446), ("PAS", 0x0463),
+    ("PLK", 0x0415), ("PTG", 0x0816), ("PTG-BR", 0x0416), ("RMS", 0x0417), ("ROM", 0x0418),
+    ("RUS", 0x0419), ("SAN", 0x044F), ("SKY", 0x041B), ("SLV", 0x0424), ("SQI", 0x041C),
+    ("SRB", 0x081A), ("SVE", 0x041D), ("TAM", 0x0449), ("TAT", 0x0444), ("TEL", 0x044A),
+    ("THA", 0x041E), ("TIB", 0x0451), ("TRK", 0x041F), ("UKR", 0x0422), ("URD", 0x0420),
+    ("USB", 0x042E), ("UYG", 0x0480), ("UZB", 0x0443), ("VIT", 0x042A), ("WEL", 0x0452),
+    ("ZHH", 0x0C04), ("ZHS", 0x0804), ("ZHT", 0x0404),
+    ("dflt", 0x0409),
 ];
 
 impl RawFeature {
@@ -1971,11 +1972,12 @@ impl RawFeature {
             .iter()
             .filter_map(|label| {
                 GLYPHS_TO_OPENTYPE_LANGUAGE_ID
-                    .iter()
-                    .find(|entry| entry.0 == label.language)
-                    .map(|entry| {
+                    .binary_search_by_key(&label.language, |entry| entry.0.to_owned())
+                    .ok()
+                    .map(|index| {
+                        let language_id = &GLYPHS_TO_OPENTYPE_LANGUAGE_ID[index].1;
                         let name = label.value.replace("\\", "\\005c").replace("\"", "\\0022");
-                        format!("  name 3 1 0x{:04X} \"{}\";", entry.1, name)
+                        format!("  name 3 1 0x{:04X} \"{}\";", language_id, name)
                     })
                     .or_else(|| {
                         warn!("Unknown feature label language: {}", label.language);