diff --git a/library/rsa.c b/library/rsa.c
index 5366abc..bf24a09 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -274,7 +274,7 @@
 
     if( pq_missing )
     {
-        ret = mbedtls_rsa_deduce_primes( &ctx->N, &ctx->D, &ctx->E,
+        ret = mbedtls_rsa_deduce_primes( &ctx->N, &ctx->E, &ctx->D,
                                          &ctx->P, &ctx->Q );
         if( ret != 0 )
             return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA + ret );