diff --git a/library/pk.c b/library/pk.c
index 29123eb..857bafc 100644
--- a/library/pk.c
+++ b/library/pk.c
@@ -591,7 +591,7 @@
 
     ret = uECC_verify( keypair->public_key, hash,
                        (unsigned) hash_len, signature, uecc_curve );
-    if( ret == 0 )
+    if( ret != UECC_SUCCESS )
         return( MBEDTLS_ERR_PK_HW_ACCEL_FAILED );
 
     return( 0 );