diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 0caaa28..7fbf9f8 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -2055,31 +2055,25 @@
           MBEDTLS_ECDSA_C */
 
 #if defined(MBEDTLS_SHA256_C) && \
-    defined(MBEDTLS_PKCS1_V21) && \
-    defined(MBEDTLS_RSA_C)
+    defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
             case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
                 break;
 #endif /* MBEDTLS_SHA256_C && \
-          MBEDTLS_PKCS1_V21 && \
-          MBEDTLS_RSA_C */
+          MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 
 #if defined(MBEDTLS_SHA384_C) && \
-    defined(MBEDTLS_PKCS1_V21) && \
-    defined(MBEDTLS_RSA_C)
+    defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
             case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384:
                 break;
 #endif /* MBEDTLS_SHA384_C && \
-          MBEDTLS_PKCS1_V21 && \
-          MBEDTLS_RSA_C */
+          MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 
 #if defined(MBEDTLS_SHA512_C) && \
-    defined(MBEDTLS_PKCS1_V21) && \
-    defined(MBEDTLS_RSA_C)
+    defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
             case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
                 break;
 #endif /* MBEDTLS_SHA512_C && \
-          MBEDTLS_PKCS1_V21 && \
-          MBEDTLS_RSA_C */
+          MBEDTLS_X509_RSASSA_PSS_SUPPORT */
 
 #if defined(MBEDTLS_SHA256_C) && \
     defined(MBEDTLS_PKCS1_V15) && \
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index d1dcaed..e71456e 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -338,6 +338,7 @@
     /* We currently only support ECDSA-based signatures */
     switch( algorithm )
     {
+#if defined(MBEDTLS_ECDSA_C)
         case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256:
             md_alg = MBEDTLS_MD_SHA256;
             sig_alg = MBEDTLS_PK_ECDSA;
@@ -350,7 +351,9 @@
             md_alg = MBEDTLS_MD_SHA512;
             sig_alg = MBEDTLS_PK_ECDSA;
             break;
-#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
+#endif /* MBEDTLS_ECDSA_C */
+
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
 #if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
             md_alg = MBEDTLS_MD_SHA256;
@@ -371,7 +374,7 @@
             sig_alg = MBEDTLS_PK_RSASSA_PSS;
             break;
 #endif /* MBEDTLS_SHA512_C */
-#endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */
+#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
         default:
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "Certificate Verify: Unknown signature algorithm." ) );
             goto error;