diff --git a/programs/pkey/pk_encrypt.c b/programs/pkey/pk_encrypt.c
index 22dedba..2313818 100644
--- a/programs/pkey/pk_encrypt.c
+++ b/programs/pkey/pk_encrypt.c
@@ -59,6 +59,15 @@
     return( 0 );
 }
 #else
+
+#if defined( MBEDTLS_CHECK_PARAMS ) && defined(MBEDTLS_PLATFORM_C)
+void mbedtls_param_failed( char* failure_condition, char* file, int line )
+{
+    mbedtls_printf("%s:%i: Input param failed - %sn", file, line,                           failure_condition );
+    mbedtls_exit( MBEDTLS_EXIT_FAILURE );
+}
+#endif
+
 int main( int argc, char *argv[] )
 {
     FILE *f;