diff --git a/src/share/classes/sun/security/ssl/SupportedEllipticCurvesExtension.java b/src/share/classes/sun/security/ssl/SupportedEllipticCurvesExtension.java
index 5d28740b695c608feb6197a29dd1473aecd786a1..b7757d6a3d1e5316c3f66a22aded697afd6eb503 100644
--- a/src/share/classes/sun/security/ssl/SupportedEllipticCurvesExtension.java
+++ b/src/share/classes/sun/security/ssl/SupportedEllipticCurvesExtension.java
@@ -280,7 +280,7 @@ final class SupportedEllipticCurvesExtension extends HelloExtension {
     private static int getPreferredCurve(int[] curves,
                 AlgorithmConstraints constraints) {
         for (int curveId : curves) {
-            if (constraints.permits(
+            if (isSupported(curveId) && constraints.permits(
                     EnumSet.of(CryptoPrimitive.KEY_AGREEMENT),
                                 "EC", idToParams.get(curveId))) {
                 return curveId;