diff --git a/library/ecdsa.c b/library/ecdsa.c
index eb3c303..618c7b0 100644
--- a/library/ecdsa.c
+++ b/library/ecdsa.c
@@ -234,6 +234,24 @@
 }
 #endif /* ECDSA_DETERMINISTIC || !ECDSA_SIGN_ALT || !ECDSA_VERIFY_ALT */
 
+#if !defined(MBEDTLS_ECDSA_SIGN_ALT)     || \
+    !defined(MBEDTLS_ECDSA_VERIFY_ALT)
+
+int mbedtls_ecdsa_can_do(mbedtls_ecp_group_id gid)
+{
+    switch (gid) {
+#ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED
+        case MBEDTLS_ECP_DP_CURVE25519: return 0;
+#endif
+#ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED
+        case MBEDTLS_ECP_DP_CURVE448: return 0;
+#endif
+        default: return 1;
+    }
+}
+
+#endif /* !ECDSA_SIGN_ALT || !ECDSA_VERIFY_ALT */
+
 #if !defined(MBEDTLS_ECDSA_SIGN_ALT)
 /*
  * Compute ECDSA signature of a hashed message (SEC1 4.1.3)
@@ -373,19 +391,6 @@
     return ret;
 }
 
-int mbedtls_ecdsa_can_do(mbedtls_ecp_group_id gid)
-{
-    switch (gid) {
-#ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED
-        case MBEDTLS_ECP_DP_CURVE25519: return 0;
-#endif
-#ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED
-        case MBEDTLS_ECP_DP_CURVE448: return 0;
-#endif
-        default: return 1;
-    }
-}
-
 /*
  * Compute ECDSA signature of a hashed message
  */