diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index c594b69..950319a 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -695,8 +695,9 @@
  *
  * Uncomment this macro to enable restartable ECC computations.
  *
- * \note  MBEDTLS_ECP_RESTARTABLE cannot be defined if there is an alternative
- *        implementation for one of the ECP, ECDSA or ECDH functions. *
+ * \note  This option only works with the default software implementation of
+ *        elliptic curve functionality. It is incompatible with
+ *        MBEDTLS_ECP_ALT, MBEDTLS_ECDH_xxx_ALT and MBEDTLS_ECDSA_xxx_ALT.
  */
 //#define MBEDTLS_ECP_RESTARTABLE
 
diff --git a/library/ecdh.c b/library/ecdh.c
index b7e25dc..307ee1f 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -191,14 +191,14 @@
 {
     int ret;
     size_t grp_len, pt_len;
-#if !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
+#if defined(MBEDTLS_ECP_RESTARTABLE)
     mbedtls_ecp_restart_ctx *rs_ctx = NULL;
 #endif
 
     if( ctx == NULL || ctx->grp.pbits == 0 )
         return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
 
-#if defined(MBEDTLS_ECP_RESTARTABLE) && !defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
+#if defined(MBEDTLS_ECP_RESTARTABLE)
     if( ctx->restart_enabled )
         rs_ctx = &ctx->rs;
 #endif