diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index f248bdc..09807fa 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -143,6 +143,16 @@
  *
 #define POLARSSL_AES_ROM_TABLES
  */
+
+/**
+ * \def POLARSSL_RSA_NO_CRT
+ *
+ * Do not use the Chinese Remainder Theorem for the RSA private operation.
+ *
+ * Uncomment this macro to disable the use of CRT in RSA.
+ *
+#define POLARSSL_RSA_NO_CRT
+ */
 /* \} name */
 
 /**
diff --git a/library/rsa.c b/library/rsa.c
index 0a6c490..a0f750e 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -253,7 +253,7 @@
         return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
     }
 
-#if 0
+#if defined(POLARSSL_RSA_NO_CRT)
     MPI_CHK( mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
 #else
     /*