diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index e2c04af..6807ff3 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -270,12 +270,14 @@
 #endif
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) &&                 \
-    ( !defined(MBEDTLS_ECDH_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) )
+    ( !( defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_USE_TINYCRYPT) ) || \
+      !defined(MBEDTLS_X509_CRT_PARSE_C) )
 #error "MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED defined, but not all prerequisites"
 #endif
 
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) &&                 \
-    ( !defined(MBEDTLS_ECDH_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) )
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) &&                   \
+    ( !( defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_USE_TINYCRYPT) ) || \
+      !defined(MBEDTLS_X509_CRT_PARSE_C) )
 #error "MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED defined, but not all prerequisites"
 #endif
 
@@ -284,7 +286,7 @@
 #endif
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) &&                     \
-    !defined(MBEDTLS_ECDH_C)
+    !(defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_USE_TINYCRYPT) )
 #error "MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED defined, but not all prerequisites"
 #endif
 
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 74d7e40..9282fbc 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -536,9 +536,11 @@
     unsigned char _pms_ecdhe_psk_uecc[4 + NUM_ECC_BYTES +
                                       + MBEDTLS_PSK_MAX_LEN];     /* RFC 5489 2 */
 #endif /* MBEDTLS_USE_TINYCRYPT */
+#if defined(MBEDTLS_ECP_C)
     unsigned char _pms_ecdhe_psk[4 + MBEDTLS_ECP_MAX_BYTES
                                    + MBEDTLS_PSK_MAX_LEN];     /* RFC 5489 2 */
 #endif
+#endif
 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
     unsigned char _pms_ecjpake[32];     /* Thread spec: SHA-256 output */
 #endif