diff --git a/dump1090.c b/dump1090.c
index 72b3e08..8df3059 100644
--- a/dump1090.c
+++ b/dump1090.c
@@ -154,6 +154,7 @@ void modesInitConfig(void) {
     Modes.net_fatsv_port          = MODES_NET_OUTPUT_FA_TSV_PORT;
     Modes.interactive_rows        = getTermRows();
     Modes.interactive_display_ttl = MODES_INTERACTIVE_DISPLAY_TTL;
+    Modes.html_dir                = HTMLPATH;
     Modes.json_interval           = 1000;
     Modes.json_location_accuracy  = 1;
     Modes.maxRange                = 1852 * 300; // 300NM default max range
@@ -713,6 +714,7 @@ void showHelp(void) {
 "--quiet                  Disable output to stdout. Use for daemon applications\n"
 "--show-only <addr>       Show only messages from the given ICAO on stdout\n"
 "--ppm <error>            Set receiver error in parts per million (default 0)\n"
+"--html-dir <dir>         Use <dir> as base directory for the internal HTTP server. Defaults to " HTMLPATH "\n"
 "--write-json <dir>       Periodically write json output to <dir> (for serving by a separate webserver)\n"
 "--write-json-every <t>   Write json output every t seconds (default 1)\n"
 "--json-location-accuracy <n>  Accuracy of receiver location in json metadata: 0=no location, 1=approximate, 2=exact\n"
@@ -1060,6 +1062,8 @@ int main(int argc, char **argv) {
             Modes.interactive_rtl1090 = 1;
         } else if (!strcmp(argv[j],"--oversample")) {
             Modes.oversample = 1;
+        } else if (!strcmp(argv[j], "--html-dir") && more) {
+            Modes.html_dir = strdup(argv[++j]);
 #ifndef _WIN32
         } else if (!strcmp(argv[j], "--write-json") && more) {
             Modes.json_dir = strdup(argv[++j]);
diff --git a/dump1090.h b/dump1090.h
index c175bea..23ece25 100644
--- a/dump1090.h
+++ b/dump1090.h
@@ -325,6 +325,7 @@ struct {                             // Internal state
     int   interactive_rtl1090;       // flight table in interactive mode is formatted like RTL1090
     char *json_dir;                  // Path to json base directory, or NULL not to write json.
     uint64_t json_interval;          // Interval between rewriting the json aircraft file, in milliseconds; also the advertised map refresh interval
+    char *html_dir;                  // Path to www base directory.
     int   json_location_accuracy;    // Accuracy of location metadata: 0=none, 1=approx, 2=exact
     int   throttle;                  // When reading from a file, throttle file playback to realtime?
 
diff --git a/net_io.c b/net_io.c
index 26601f4..3c9374d 100644
--- a/net_io.c
+++ b/net_io.c
@@ -1315,15 +1315,15 @@ static int handleHTTPRequest(struct client *c, char *p) {
         char getFile[1024];
 
         if (strlen(url) < 2) {
-            snprintf(getFile, sizeof getFile, "%s/gmap.html", HTMLPATH); // Default file
+            snprintf(getFile, sizeof getFile, "%s/gmap.html", Modes.html_dir); // Default file
         } else {
-            snprintf(getFile, sizeof getFile, "%s/%s", HTMLPATH, url);
+            snprintf(getFile, sizeof getFile, "%s/%s", Modes.html_dir, url);
         }
 
         if (!realpath(getFile, rp))
             rp[0] = 0;
-        if (!realpath(HTMLPATH, hrp))
-            strcpy(hrp, HTMLPATH);
+        if (!realpath(Modes.html_dir, hrp))
+            strcpy(hrp, Modes.html_dir);
 
         clen = -1;
         content = strdup("Server error occured");
@@ -1342,7 +1342,7 @@ static int handleHTTPRequest(struct client *c, char *p) {
 
         if (clen < 0) {
             content = realloc(content, 128);
-            clen = snprintf(content, 128,"Error opening HTML file: %s", strerror(errno));
+            clen = snprintf(content, 128, "Error opening HTML file: %s", strerror(errno));
             statuscode = 404;
             statusmsg = "Not Found";
         }