diff --git a/src/tls/tlsv1_cred.c b/src/tls/tlsv1_cred.c
index 842e5dd..01b2f83 100644
--- a/src/tls/tlsv1_cred.c
+++ b/src/tls/tlsv1_cred.c
@@ -130,7 +130,7 @@
 			return -1;
 		}
 
-		der = base64_decode(pos, end - pos, &der_len);
+		der = base64_decode((const char *) pos, end - pos, &der_len);
 		if (der == NULL) {
 			wpa_printf(MSG_INFO, "TLSv1: Could not decode PEM "
 				   "certificate");
@@ -293,7 +293,7 @@
 		}
 	}
 
-	der = base64_decode(pos, end - pos, &der_len);
+	der = base64_decode((const char *) pos, end - pos, &der_len);
 	if (!der)
 		return NULL;
 	pkey = crypto_private_key_import(der, der_len, NULL);
@@ -321,7 +321,7 @@
 	if (!end)
 		return NULL;
 
-	der = base64_decode(pos, end - pos, &der_len);
+	der = base64_decode((const char *) pos, end - pos, &der_len);
 	if (!der)
 		return NULL;
 	pkey = crypto_private_key_import(der, der_len, passwd);
@@ -1225,7 +1225,7 @@
 		return -1;
 	}
 
-	der = base64_decode(pos, end - pos, &der_len);
+	der = base64_decode((const char *) pos, end - pos, &der_len);
 	if (der == NULL) {
 		wpa_printf(MSG_INFO, "TLSv1: Could not decode PEM dhparams");
 		return -1;