diff --git a/scan_lists.cc b/scan_lists.cc
index a9b8993cc..e9092b3e9 100644
--- a/scan_lists.cc
+++ b/scan_lists.cc
@@ -409,21 +409,33 @@ static void getpts_aux(const char *origexpr, int nested, u8 *porttbl, int range_
       if (*current_range == 'T' && *(current_range+1) == ':') {
         current_range += 2;
         range_type = SCAN_TCP_PORT;
+        if (!o.TCPScan()) {
+          error("WARNING: Your ports include \"T:\" but you haven't specified any TCP scan type.");
+        }
         continue;
       }
       if (*current_range == 'U' && *(current_range+1) == ':') {
         current_range += 2;
         range_type = SCAN_UDP_PORT;
+        if (!o.UDPScan()) {
+          error("WARNING: Your ports include \"U:\" but you haven't specified UDP scan with -sU.");
+        }
         continue;
       }
       if (*current_range == 'S' && *(current_range+1) == ':') {
         current_range += 2;
         range_type = SCAN_SCTP_PORT;
+        if (!o.SCTPScan()) {
+          error("WARNING: Your ports include \"S:\" but you haven't specified any SCTP scan type.");
+        }
         continue;
       }
       if (*current_range == 'P' && *(current_range+1) == ':') {
         current_range += 2;
         range_type = SCAN_PROTOCOLS;
+        if (!o.ipprotscan) {
+          error("WARNING: Your ports include \"P:\" but you haven't specified IP Protocol scan with -sO.");
+        }
         continue;
       }
     }