diff --git a/notiming.c b/notiming.c
new file mode 100644
index 00000000..2d0fc5d5
--- /dev/null
+++ b/notiming.c
@@ -0,0 +1,15 @@
+/*
+ * notiming.c: stub version of schedule_timer().
+ * 
+ * Used in key generation tools, which need the random number
+ * generator but don't want the hassle of calling noise_regular()
+ * at regular intervals - and don't _need_ it either, since they
+ * have their own rigorous and different means of noise collection.
+ */
+
+#include "putty.h"
+
+long schedule_timer(int ticks, timer_fn_t fn, void *ctx)
+{
+    return 0;
+}