diff --git a/gnutls-hmac.patch b/gnutls-hmac.patch
index 8274810..16b02b7 100644
--- a/gnutls-hmac.patch
+++ b/gnutls-hmac.patch
@@ -1025,15 +1025,15 @@ index 3ac3206df..2fa447984 100644
 +  GHmac *copy;
 +
 +  /* No MD5 in FIPS mode. */
-+  hmac = g_hmac_new (G_CHECKSUM_MD5, "abc123", sizeof ("abc123"));
++  hmac = g_hmac_new (G_CHECKSUM_MD5, (guchar *)"abc123", sizeof ("abc123"));
 +  g_assert_null (hmac);
 +
 +  /* SHA-256 should be good. */
-+  hmac = g_hmac_new (G_CHECKSUM_SHA256, "abc123", sizeof ("abc123"));
++  hmac = g_hmac_new (G_CHECKSUM_SHA256, (guchar *)"abc123", sizeof ("abc123"));
 +  g_assert_nonnull (hmac);
 +
 +  /* Ensure g_hmac_update() does not crash when called with -1. */
-+  g_hmac_update (hmac, "You win again, gravity!", -1);
++  g_hmac_update (hmac, (guchar *)"You win again, gravity!", -1);
 +
 +  /* Ensure g_hmac_copy() does not crash. */
 +  copy = g_hmac_copy (hmac);