diff --git a/src/sist.h b/src/sist.h
index 4e7bd11..894f637 100644
--- a/src/sist.h
+++ b/src/sist.h
@@ -49,7 +49,7 @@
 #include <ctype.h>
 #include "git_hash.h"
 
-#define VERSION "2.12.1"
+#define VERSION "2.12.2"
 static const char *const Version = VERSION;
 
 #ifndef SIST_PLATFORM
diff --git a/src/web/serve.c b/src/web/serve.c
index 69d4a01..188c04e 100644
--- a/src/web/serve.c
+++ b/src/web/serve.c
@@ -285,8 +285,12 @@ void serve_file_from_disk(cJSON *json, index_t *idx, struct mg_connection *nc, s
              "Accept-Ranges: bytes\r\nCache-Control: no-store\r\n",
              name, strlen(ext) == 0 ? "" : ".", ext);
 
-    char mime_mapping[1024];
-    snprintf(mime_mapping, sizeof(mime_mapping), "%s=%s", ext, mime);
+    char mime_mapping[8192];
+    if (strlen(ext) == 0) {
+        snprintf(mime_mapping, sizeof(mime_mapping), "%s=%s", full_path, mime);
+    } else {
+        snprintf(mime_mapping, sizeof(mime_mapping), "%s=%s", ext, mime);
+    }
 
     struct mg_http_serve_opts opts = {
             .extra_headers = disposition,