diff --git a/src/libsodium/crypto_sign/ed25519/ref10/open.c b/src/libsodium/crypto_sign/ed25519/ref10/open.c
index c9ac6a33..aafecf64 100644
--- a/src/libsodium/crypto_sign/ed25519/ref10/open.c
+++ b/src/libsodium/crypto_sign/ed25519/ref10/open.c
@@ -23,7 +23,11 @@ _crypto_sign_ed25519_verify_detached(const unsigned char *sig,
     ge25519_p3               A;
     ge25519_p2               R;
 
-#ifndef ED25519_COMPAT
+#ifdef ED25519_COMPAT
+    if (sig[63] & 224) {
+        return -1;
+    }
+#else
     if (sc25519_is_canonical(sig + 32) == 0 ||
         ge25519_has_small_order(sig) != 0) {
         return -1;
@@ -32,10 +36,6 @@ _crypto_sign_ed25519_verify_detached(const unsigned char *sig,
         ge25519_has_small_order(pk) != 0) {
         return -1;
     }
-#else
-    if (sig[63] & 224) {
-        return -1;
-    }
 #endif
     if (ge25519_frombytes_negate_vartime(&A, pk) != 0) {
         return -1;