diff --git a/include/glib-compat.h b/include/glib-compat.h
index 86be439ba0..2e32b90f05 100644
--- a/include/glib-compat.h
+++ b/include/glib-compat.h
@@ -36,6 +36,13 @@
 #include <pwd.h>
 #endif
 
+/*
+ * These functions perform function pointer casts which can cause function call
+ * failure on Emscripten. Use g_slist_sort_with_data and g_list_sort_with_data
+ * instead of these functions.
+ */
+#pragma GCC poison g_slist_sort g_list_sort
+
 /*
  * Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
  * use of functions from newer GLib via this compat header needs a little