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-rw-r--r--src/tls/tls_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/tls/tls_drv.c b/src/tls/tls_drv.c
index 02f4a26a..5e86e78f 100644
--- a/src/tls/tls_drv.c
+++ b/src/tls/tls_drv.c
@@ -250,7 +250,7 @@ static int tls_drv_control(ErlDrvData handle,
rlen++;
b = driver_alloc_binary(rlen);
b->orig_bytes[0] = 0;
- tmp_buf = &b->orig_bytes[1];
+ tmp_buf = (unsigned char *)&b->orig_bytes[1];
i2d_X509(cert, &tmp_buf);
X509_free(cert);
*rbuf = (char *)b;