diff --git a/src/buffered-io.cc b/src/buffered-io.cc
index 6d3ab6d..4354740 100644
--- a/src/buffered-io.cc
+++ b/src/buffered-io.cc
@@ -1,7 +1,11 @@
-#include "buffered-io.hh"
 #include <string.h>
 #include <unistd.h>
 #include <nix/signals.hh>
+#include <errno.h>
+#include <stdlib.h>
+#include <error.hh>
+
+#include "buffered-io.hh"
 
 [[nodiscard]] int tryWriteLine(int fd, std::string s) {
     s += "\n";
diff --git a/src/drv.cc b/src/drv.cc
index 2eca9b0..14fd352 100644
--- a/src/drv.cc
+++ b/src/drv.cc
@@ -1,10 +1,27 @@
-#include "drv.hh"
-#include <nix/config.h>
+#include <nix/config.h> // IWYU pragma: keep
+
 #include <nix/path-with-outputs.hh>
 #include <nix/store-api.hh>
 #include <nix/local-fs-store.hh>
 #include <nix/value-to-json.hh>
 #include <nix/derivations.hh>
+#include <stdint.h>
+#include <nix/derived-path-map.hh>
+#include <nix/eval.hh>
+#include <nix/get-drvs.hh>
+#include <nix/nixexpr.hh>
+#include <nlohmann/detail/json_ref.hpp>
+#include <nix/path.hh>
+#include <nix/ref.hh>
+#include <nix/value/context.hh>
+#include <exception>
+#include <memory>
+#include <sstream>
+#include <utility>
+#include <vector>
+
+#include "drv.hh"
+#include "eval-args.hh"
 
 static bool queryIsCached(nix::Store &store,
                           std::map<std::string, std::string> &outputs) {
diff --git a/src/drv.hh b/src/drv.hh
index 4f1fbd0..a5de64a 100644
--- a/src/drv.hh
+++ b/src/drv.hh
@@ -1,16 +1,22 @@
+#include <nix/get-drvs.hh>
+#include <nix/eval.hh>
+#include <nlohmann/json.hpp>
+#include <nlohmann/json_fwd.hpp>
 #include <string>
 #include <map>
 #include <set>
 #include <string>
 #include <optional>
 
-#include <nix/get-drvs.hh>
-#include <nix/eval.hh>
-
-#include <nlohmann/json.hpp>
-
 #include "eval-args.hh"
 
+class MyArgs;
+
+namespace nix {
+class EvalState;
+struct DrvInfo;
+}  // namespace nix
+
 /* The fields of a derivation that are printed in json form */
 struct Drv {
     std::string name;
diff --git a/src/eval-args.cc b/src/eval-args.cc
index b25ecc7..5ccf732 100644
--- a/src/eval-args.cc
+++ b/src/eval-args.cc
@@ -1,3 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <nix/args.hh>
+#include <nix/file-system.hh>
+#include <nix/flake/flake.hh>
+#include <nix/flake/lockfile.hh>
+#include <functional>
+#include <map>
+#include <memory>
+#include <set>
+#include <utility>
+
 #include "eval-args.hh"
 
 MyArgs::MyArgs() : MixCommonArgs("nix-eval-jobs") {
diff --git a/src/eval-args.hh b/src/eval-args.hh
index e0ce2d2..fe50583 100644
--- a/src/eval-args.hh
+++ b/src/eval-args.hh
@@ -1,9 +1,14 @@
 #pragma once
 
-#include <string>
 #include <nix/flake/flake.hh>
 #include <nix/args/root.hh>
 #include <nix/common-eval-args.hh>
+#include <stddef.h>
+#include <nix/common-args.hh>
+#include <nix/flake/flakeref.hh>
+#include <nix/types.hh>
+#include <string>
+#include <optional>
 
 class MyArgs : virtual public nix::MixEvalArgs,
                virtual public nix::MixCommonArgs,
diff --git a/src/nix-eval-jobs.cc b/src/nix-eval-jobs.cc
index 0fe5a39..704afe1 100644
--- a/src/nix-eval-jobs.cc
+++ b/src/nix-eval-jobs.cc
@@ -1,30 +1,49 @@
-#include <map>
-#include <sys/signal.h>
-#include <thread>
-#include <condition_variable>
-#include <filesystem>
+#include <nix/config.h> // IWYU pragma: keep
 
-#include <nix/config.h>
 #include <nix/eval-settings.hh>
-#include <nix/common-eval-args.hh>
-#include <nix/args/root.hh>
 #include <nix/shared.hh>
 #include <nix/sync.hh>
 #include <nix/eval.hh>
-#include <nix/get-drvs.hh>
-#include <nix/value-to-json.hh>
-#include <nix/local-fs-store.hh>
 #include <nix/signals.hh>
 #include <nix/terminal.hh>
 #include <sys/wait.h>
+#include <nlohmann/json.hpp>
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <nix/attr-set.hh>
+#include <nix/config.hh>
+#include <nix/error.hh>
+#include <nix/file-descriptor.hh>
+#include <nix/globals.hh>
+#include <nix/logging.hh>
+#include <nlohmann/detail/iterators/iter_impl.hpp>
+#include <nlohmann/detail/json_ref.hpp>
+#include <nlohmann/json_fwd.hpp>
+#include <nix/processes.hh>
+#include <nix/ref.hh>
+#include <nix/store-api.hh>
+#include <map>
+#include <thread>
+#include <condition_variable>
+#include <filesystem>
+#include <exception>
+#include <functional>
+#include <iostream>
+#include <memory>
+#include <optional>
+#include <set>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
 
 #include "eval-args.hh"
-#include "drv.hh"
 #include "buffered-io.hh"
 #include "worker.hh"
 
-#include <nlohmann/json.hpp>
-
 using namespace nix;
 using namespace nlohmann;
 
diff --git a/src/worker.cc b/src/worker.cc
index 42d4d73..cb0a7d3 100644
--- a/src/worker.cc
+++ b/src/worker.cc
@@ -1,14 +1,52 @@
-#include "worker.hh"
-#include "drv.hh"
-#include "buffered-io.hh"
+#include <nix/config.h> // IWYU pragma: keep
+
+// doesn't exist on macOS
+// IWYU pragma: no_include <bits/types/struct_rusage.h>
 
 #include <nix/terminal.hh>
 #include <nix/attr-path.hh>
 #include <nix/local-fs-store.hh>
 #include <nix/installable-flake.hh>
-
 #include <sys/resource.h>
 #include <nlohmann/json.hpp>
+#include <stdio.h>
+#include <stdlib.h>
+#include <nix/attr-set.hh>
+#include <nix/canon-path.hh>
+#include <nix/common-eval-args.hh>
+#include <nix/error.hh>
+#include <nix/eval-inline.hh>
+#include <nix/eval.hh>
+#include <nix/file-descriptor.hh>
+#include <nix/file-system.hh>
+#include <nix/flake/flakeref.hh>
+#include <nix/get-drvs.hh>
+#include <nix/input-accessor.hh>
+#include <nix/logging.hh>
+#include <nix/nixexpr.hh>
+#include <nlohmann/detail/json_ref.hpp>
+#include <nlohmann/json_fwd.hpp>
+#include <nix/ref.hh>
+#include <nix/store-api.hh>
+#include <nix/symbol-table.hh>
+#include <nix/types.hh>
+#include <nix/util.hh>
+#include <nix/value.hh>
+#include <exception>
+#include <map>
+#include <memory>
+#include <numeric>
+#include <optional>
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "worker.hh"
+#include "drv.hh"
+#include "buffered-io.hh"
+#include "eval-args.hh"
 
 static nix::Value *releaseExprTopLevelValue(nix::EvalState &state,
                                             nix::Bindings &autoArgs,
diff --git a/src/worker.hh b/src/worker.hh
index 0f7d735..45e9032 100644
--- a/src/worker.hh
+++ b/src/worker.hh
@@ -1,9 +1,17 @@
 #pragma once
-#include <nix/config.h>
 #include <nix/shared.hh>
 #include <nix/eval.hh>
 
 #include "eval-args.hh"
 
+class MyArgs;
+
+namespace nix {
+class AutoCloseFD;
+class Bindings;
+class EvalState;
+template <typename T> class ref;
+}  // namespace nix
+
 void worker(nix::ref<nix::EvalState> state, nix::Bindings &autoArgs,
             nix::AutoCloseFD &to, nix::AutoCloseFD &from, MyArgs &args);