diff --git a/programs/pkey/rsa_verify.c b/programs/pkey/rsa_verify.c
index 022ef33..cb42563 100644
--- a/programs/pkey/rsa_verify.c
+++ b/programs/pkey/rsa_verify.c
@@ -57,7 +57,7 @@
     int ret, c;
     size_t i;
     rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];