diff --git a/src/token-instructions.js b/src/token-instructions.js
index 087b7a1..fd98b0b 100644
--- a/src/token-instructions.js
+++ b/src/token-instructions.js
@@ -31,6 +31,11 @@ LAYOUT.addVariant(
   BufferLayout.struct([BufferLayout.nu64('amount')]),
   'transfer',
 );
+LAYOUT.addVariant(
+  4,
+  BufferLayout.struct([BufferLayout.nu64('amount')]),
+  'approve'
+);
 LAYOUT.addVariant(
   7,
   BufferLayout.struct([BufferLayout.nu64('amount')]),