diff --git a/wolfcrypt/test/test.c b/wolfcrypt/test/test.c
index 05bf20bbe..89bd2b77e 100644
--- a/wolfcrypt/test/test.c
+++ b/wolfcrypt/test/test.c
@@ -35648,8 +35648,8 @@ static wc_test_ret_t curve255519_der_test(void)
         0xA2, 0x5B, 0x38, 0xFD, 0x96, 0xDB, 0x2A, 0x26
     };
     curve25519_key key;
-    byte output[128];
-    word32 outputSz = 128;
+    byte output[CURVE25519_MAX_KEY_TO_DER_SZ];
+    word32 outputSz = (word32)sizeof(output);
     word32 idx;
 
     ret = wc_curve25519_init_ex(&key, HEAP_HINT, devId);
diff --git a/wolfssl/wolfcrypt/curve25519.h b/wolfssl/wolfcrypt/curve25519.h
index 79fb6d9af..acdb9574a 100644
--- a/wolfssl/wolfcrypt/curve25519.h
+++ b/wolfssl/wolfcrypt/curve25519.h
@@ -45,6 +45,12 @@
 #define CURVE25519_KEYSIZE 32
 #define CURVE25519_PUB_KEY_SIZE 32
 
+enum {
+    CURVE25519_MAX_KEY_TO_DER_SZ = 82,  /* for exported DER keys temp buffer */
+
+    WOLF_ENUM_DUMMY_LAST_ELEMENT(CURVE25519)
+};
+
 #ifdef WOLFSSL_NAMES_STATIC
 typedef char curve25519_str[12];
 #else