diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index 7ec4675..dcfc0fc 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -59,6 +59,14 @@
 #include <stdio.h>
 #include <string.h>
 
+#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;