diff --git a/Cargo.toml b/Cargo.toml
index f2366786506d8a854121ed62b15c308638685211..2649689a2a68f04dc007d8e3c67b2af86922f4a6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,8 +39,9 @@ crate-type = ["lib", "cdylib", "staticlib"]
 
 [features]
 default = [
-    "crypto-botan",
+    "crypto-botan2",
 ]
 crypto-nettle = ["sequoia-openpgp/crypto-nettle"]
 crypto-botan = ["sequoia-openpgp/crypto-botan"]
+crypto-botan2 = ["sequoia-openpgp/crypto-botan2"]
 crypto-cng = ["sequoia-openpgp/crypto-cng"]
diff --git a/build.rs b/build.rs
index 9c04e9429c5e1ffef9dc12a18d289e164b15dcf4..bd1fef9afee6e5bc668ba90fe5ed3d296a2197a0 100644
--- a/build.rs
+++ b/build.rs
@@ -40,8 +40,10 @@ fn main() -> Result<(), std::io::Error> {
     // directory.
     let content = String::from_utf8(content).unwrap()
         .replace("REQUIRES",
-                 if cfg!(feature = "crypto-botan") {
+                 if cfg!(feature = "crypto-botan2") {
                      "botan-2"
+                 } else if cfg!(feature = "crypto-botan3") {
+                     "botan-3"
                  } else if cfg!(feature = "crypto-nettle") {
                      "nettle"
                  } else if cfg!(feature = "crypto-cng") {