diff --git a/lib/url.c b/lib/url.c
index 38a2a27da..3b5eb97b3 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2970,7 +2970,7 @@ static CURLcode CreateConnection(struct SessionHandle *data,
     conn->remote_port = PORT_HTTP;
     conn->protocol |= PROT_HTTP;
     conn->curl_do = Curl_http;
-    conn->curl_do_more = NULL;
+    conn->curl_do_more = (Curl_do_more_func)NULL;
     conn->curl_done = Curl_http_done;
     conn->curl_connect = Curl_http_connect;
 #else
@@ -2987,7 +2987,7 @@ static CURLcode CreateConnection(struct SessionHandle *data,
     conn->protocol |= PROT_HTTP|PROT_HTTPS|PROT_SSL;
 
     conn->curl_do = Curl_http;
-    conn->curl_do_more = NULL;
+    conn->curl_do_more = (Curl_do_more_func)NULL;
     conn->curl_done = Curl_http_done;
     conn->curl_connect = Curl_http_connect;
     conn->curl_connecting = Curl_https_connecting;
@@ -3100,7 +3100,7 @@ static CURLcode CreateConnection(struct SessionHandle *data,
     conn->port = PORT_DICT;
     conn->remote_port = PORT_DICT;
     conn->curl_do = Curl_dict;
-    conn->curl_done = NULL; /* no DICT-specific done */
+    conn->curl_done = (Curl_done_func)NULL; /* no DICT-specific done */
 #else
     failf(data, LIBCURL_NAME
           " was built with DICT disabled!");
@@ -3112,7 +3112,7 @@ static CURLcode CreateConnection(struct SessionHandle *data,
     conn->port = PORT_LDAP;
     conn->remote_port = PORT_LDAP;
     conn->curl_do = Curl_ldap;
-    conn->curl_done = NULL; /* no LDAP-specific done */
+    conn->curl_done = (Curl_done_func)NULL; /* no LDAP-specific done */
 #else
     failf(data, LIBCURL_NAME
           " was built with LDAP disabled!");
diff --git a/lib/urldata.h b/lib/urldata.h
index 1d6bab2a0..6843925e0 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -541,6 +541,12 @@ struct Curl_async {
 #define FIRSTSOCKET     0
 #define SECONDARYSOCKET 1
 
+/* These function pointer types are here only to allow easier typecasting
+   within the source when we need to cast between data pointers (such as NULL)
+   and function pointers. */
+typedef CURLcode (*Curl_do_more_func)(struct connectdata *);
+typedef CURLcode (*Curl_done_func)(struct connectdata *, CURLcode);
+
 /*
  * The connectdata struct contains all fields and variables that should be
  * unique for an entire connection.
@@ -625,13 +631,13 @@ struct connectdata {
   /* These two functions MUST be set by the curl_connect() function to be
      be protocol dependent */
   CURLcode (*curl_do)(struct connectdata *, bool *done);
-  CURLcode (*curl_done)(struct connectdata *, CURLcode);
+  Curl_done_func curl_done;
 
   /* If the curl_do() function is better made in two halves, this
    * curl_do_more() function will be called afterwards, if set. For example
    * for doing the FTP stuff after the PASV/PORT command.
    */
-  CURLcode (*curl_do_more)(struct connectdata *);
+  Curl_do_more_func curl_do_more;
 
   /* This function *MAY* be set to a protocol-dependent function that is run
    * after the connect() and everything is done, as a step in the connection.