diff --git a/lib/pure/asyncdispatch.nim b/lib/pure/asyncdispatch.nim
index 04dbf4e4ab..b61ad7ad48 100644
--- a/lib/pure/asyncdispatch.nim
+++ b/lib/pure/asyncdispatch.nim
@@ -1983,6 +1983,8 @@ when defined(linux) or defined(windows) or defined(macosx) or defined(bsd) or
       result = 16_700_000
     elif defined(zephyr) or defined(freertos):
       result = FD_MAX
+    elif defined(emscripten):
+      result = 1024
     else:
       var fdLim: RLimit
       if getrlimit(RLIMIT_NOFILE, fdLim) < 0:
diff --git a/lib/pure/selectors.nim b/lib/pure/selectors.nim
index ec441f6dab..67d035aa7a 100644
--- a/lib/pure/selectors.nim
+++ b/lib/pure/selectors.nim
@@ -333,6 +333,8 @@ else:
         16_700_000
       elif defined(zephyr) or defined(freertos):
         FD_MAX
+      elif defined(emscripten):
+        1024
       else:
         var fdLim: RLimit
         var res = int(getrlimit(RLIMIT_NOFILE, fdLim))