diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 41bbb42..7ae9015 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -119,7 +119,7 @@
     }
 }
 
-static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, int *flags )
+static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
 {
     char buf[1024];
     ((void) data);
@@ -152,7 +152,8 @@
     mbedtls_x509_crl cacrl;
     mbedtls_pk_context pkey;
     int i, j;
-    int flags, verify = 0;
+    uint32_t flags;
+    int verify = 0;
     char *p, *q;
     const char *pers = "cert_app";