diff --git a/common/kernel/context.h b/common/kernel/context.h
index 473d9b21..763414a1 100644
--- a/common/kernel/context.h
+++ b/common/kernel/context.h
@@ -54,8 +54,6 @@ struct Context : Arch, DeterministicRNG
 
     // provided by router1.cc
     bool checkRoutedDesign() const;
-    bool getActualRouteDelay(WireId src_wire, WireId dst_wire, delay_t *delay = nullptr,
-                             dict<WireId, PipId> *route = nullptr, bool useEstimate = true);
 
     // --------------------------------------------------------------
     // Dispatch to the Arch API or pseudo-cell API accordingly
diff --git a/common/route/router1.cc b/common/route/router1.cc
index 90a77fb9..27f9497c 100644
--- a/common/route/router1.cc
+++ b/common/route/router1.cc
@@ -1485,11 +1485,4 @@ bool Context::checkRoutedDesign() const
     return true;
 }
 
-bool Context::getActualRouteDelay(WireId src_wire, WireId dst_wire, delay_t *delay, dict<WireId, PipId> *route,
-                                  bool useEstimate)
-{
-    // FIXME
-    return false;
-}
-
 NEXTPNR_NAMESPACE_END
diff --git a/ice40/delay.cc b/ice40/delay.cc
index a00cc259..ca2436a3 100644
--- a/ice40/delay.cc
+++ b/ice40/delay.cc
@@ -23,81 +23,6 @@
 
 NEXTPNR_NAMESPACE_BEGIN
 
-#define NUM_FUZZ_ROUTES 100000
-
-void ice40DelayFuzzerMain(Context *ctx)
-{
-    std::vector<WireId> srcWires, dstWires;
-
-    for (int i = 0; i < int(ctx->chip_info->wire_data.size()); i++) {
-        WireId wire;
-        wire.index = i;
-
-        switch (ctx->chip_info->wire_data[i].type) {
-        case WireInfoPOD::WIRE_TYPE_LUTFF_OUT:
-            srcWires.push_back(wire);
-            break;
-
-        case WireInfoPOD::WIRE_TYPE_LUTFF_IN_LUT:
-            dstWires.push_back(wire);
-            break;
-
-        default:
-            break;
-        }
-    }
-
-    ctx->shuffle(srcWires);
-    ctx->shuffle(dstWires);
-
-    int index = 0;
-    int cnt = 0;
-
-    while (cnt < NUM_FUZZ_ROUTES) {
-        if (index >= int(srcWires.size()) || index >= int(dstWires.size())) {
-            index = 0;
-            ctx->shuffle(srcWires);
-            ctx->shuffle(dstWires);
-        }
-
-        WireId src = srcWires[index];
-        WireId dst = dstWires[index++];
-        dict<WireId, PipId> route;
-
-#if NUM_FUZZ_ROUTES <= 1000
-        if (!ctx->getActualRouteDelay(src, dst, nullptr, &route, false))
-            continue;
-#else
-        if (!ctx->getActualRouteDelay(src, dst, nullptr, &route, true))
-            continue;
-#endif
-
-        WireId cursor = dst;
-        delay_t delay = 0;
-
-        while (1) {
-            delay += ctx->getWireDelay(cursor).maxDelay();
-
-            printf("%s %d %d %s %s %d %d\n", cursor == dst ? "dst" : "src",
-                   int(ctx->chip_info->wire_data[cursor.index].x), int(ctx->chip_info->wire_data[cursor.index].y),
-                   ctx->getWireType(cursor).c_str(ctx), ctx->nameOfWire(cursor), int(delay),
-                   int(ctx->estimateDelay(cursor, dst)));
-
-            if (cursor == src)
-                break;
-
-            PipId pip = route.at(cursor);
-            delay += ctx->getPipDelay(pip).maxDelay();
-            cursor = ctx->getPipSrcWire(pip);
-        }
-
-        cnt++;
-
-        if (cnt % 100 == 0)
-            fprintf(stderr, "Fuzzed %d arcs.\n", cnt);
-    }
-}
-
 namespace {
 
 struct model_params_t
diff --git a/ice40/main.cc b/ice40/main.cc
index 82526b8c..7afaa1fb 100644
--- a/ice40/main.cc
+++ b/ice40/main.cc
@@ -81,7 +81,6 @@ po::options_description Ice40CommandHandler::getArchOptions()
     specific.add_options()("no-promote-globals", "disable all global promotion");
     specific.add_options()("no-promote-ce", "disable promotion of 'ce' globals");
     specific.add_options()("opt-timing", "run post-placement timing optimisation pass (experimental)");
-    specific.add_options()("tmfuzz", "run path delay estimate fuzzer");
     specific.add_options()("pcf-allow-unconstrained", "don't require PCF to constrain all IO");
 
     return specific;
@@ -117,9 +116,6 @@ void Ice40CommandHandler::customBitstream(Context *ctx)
 
 void Ice40CommandHandler::setupArchContext(Context *ctx)
 {
-    if (vm.count("tmfuzz"))
-        ice40DelayFuzzerMain(ctx);
-
     if (vm.count("read")) {
         std::string filename = vm["read"].as<std::string>();
         auto f = open_ifstream_and_log_error(filename, "ASC file");