diff --git a/src/Event.h b/src/Event.h
index fe5dc9baf2..69e9fe37f9 100644
--- a/src/Event.h
+++ b/src/Event.h
@@ -145,7 +145,7 @@ protected:
 	analyzer::ID current_aid;
 	RecordVal* src_val;
 	bool draining;
-	bro::Flare queue_flare;
+	zeek::detail::Flare queue_flare;
 };
 
 extern EventMgr mgr;
diff --git a/src/Flare.cc b/src/Flare.cc
index ec3ef2073f..89e24303ab 100644
--- a/src/Flare.cc
+++ b/src/Flare.cc
@@ -6,7 +6,7 @@
 #include <fcntl.h>
 #include <errno.h>
 
-using namespace bro;
+using namespace zeek::detail;
 
 Flare::Flare()
 	: pipe(FD_CLOEXEC, FD_CLOEXEC, O_NONBLOCK, O_NONBLOCK)
diff --git a/src/Flare.h b/src/Flare.h
index ea484b2858..3fa92a6cae 100644
--- a/src/Flare.h
+++ b/src/Flare.h
@@ -4,7 +4,7 @@
 
 #include "Pipe.h"
 
-namespace bro {
+namespace zeek::detail {
 
 class Flare {
 public:
@@ -21,8 +21,7 @@ public:
 	 * @return a file descriptor that will become ready if the flare has been
 	 *         Fire()'d and not yet Extinguished()'d.
 	 */
-	int FD() const
-		{ return pipe.ReadFD(); }
+	int FD() const	{ return pipe.ReadFD(); }
 
 	/**
 	 * Put the object in the "ready" state.
@@ -44,4 +43,4 @@ private:
 	Pipe pipe;
 };
 
-} // namespace bro
+} // namespace zeek::detail
diff --git a/src/Pipe.cc b/src/Pipe.cc
index 5a0916a3dd..93ceac50ea 100644
--- a/src/Pipe.cc
+++ b/src/Pipe.cc
@@ -7,7 +7,7 @@
 #include <errno.h>
 #include <cstdio>
 
-using namespace bro;
+using namespace zeek::detail;
 
 static void pipe_fail(int eno)
 	{
diff --git a/src/Pipe.h b/src/Pipe.h
index e310c83edc..16d2bfcec2 100644
--- a/src/Pipe.h
+++ b/src/Pipe.h
@@ -2,7 +2,7 @@
 
 #pragma once
 
-namespace bro {
+namespace zeek::detail {
 
 class Pipe {
 public:
@@ -136,4 +136,4 @@ private:
 	bool swapped = false;
 };
 
-} // namespace bro
+} // namespace zeek::detail
diff --git a/src/iosource/Manager.h b/src/iosource/Manager.h
index af6f62ce77..bd875f5fae 100644
--- a/src/iosource/Manager.h
+++ b/src/iosource/Manager.h
@@ -178,7 +178,7 @@ private:
 		double GetNextTimeout() override	{ return -1; }
 
 	private:
-		bro::Flare flare;
+		zeek::detail::Flare flare;
 		};
 
 	struct Source {
diff --git a/src/supervisor/Supervisor.cc b/src/supervisor/Supervisor.cc
index df8aa63026..16f0483fa0 100644
--- a/src/supervisor/Supervisor.cc
+++ b/src/supervisor/Supervisor.cc
@@ -83,8 +83,8 @@ struct Stem {
 
 	pid_t parent_pid;
 	int last_signal = -1;
-	std::unique_ptr<bro::Flare> signal_flare;
-	std::unique_ptr<bro::PipePair> pipe;
+	std::unique_ptr<zeek::detail::Flare> signal_flare;
+	std::unique_ptr<zeek::detail::PipePair> pipe;
 	std::map<std::string, Supervisor::Node> nodes;
 	std::string msg_buffer;
 	bool shutting_down = false;
@@ -426,7 +426,7 @@ size_t Supervisor::ProcessMessages()
 	}
 
 Stem::Stem(Supervisor::StemState ss)
-	: parent_pid(ss.parent_pid), signal_flare(new bro::Flare()), pipe(std::move(ss.pipe))
+	: parent_pid(ss.parent_pid), signal_flare(new zeek::detail::Flare()), pipe(std::move(ss.pipe))
 	{
 	zeek::set_thread_name("zeek.stem");
 	pipe->Swap();
@@ -928,7 +928,7 @@ std::optional<Supervisor::StemState> Supervisor::CreateStem(bool supervisor_mode
 			fds[i] = std::stoi(zeek_stem_nums[i + 1]);
 
 		StemState ss;
-		ss.pipe = std::make_unique<bro::PipePair>(FD_CLOEXEC, O_NONBLOCK, fds);
+		ss.pipe = std::make_unique<zeek::detail::PipePair>(FD_CLOEXEC, O_NONBLOCK, fds);
 		ss.parent_pid = stem_ppid;
 		zeek::Supervisor::RunStem(std::move(ss));
 		return {};
@@ -938,7 +938,7 @@ std::optional<Supervisor::StemState> Supervisor::CreateStem(bool supervisor_mode
 		return {};
 
 	StemState ss;
-	ss.pipe = std::make_unique<bro::PipePair>(FD_CLOEXEC, O_NONBLOCK);
+	ss.pipe = std::make_unique<zeek::detail::PipePair>(FD_CLOEXEC, O_NONBLOCK);
 	ss.parent_pid = getpid();
 	ss.pid = fork();
 
diff --git a/src/supervisor/Supervisor.h b/src/supervisor/Supervisor.h
index b7800a2c83..ba381ad6dd 100644
--- a/src/supervisor/Supervisor.h
+++ b/src/supervisor/Supervisor.h
@@ -241,7 +241,7 @@ public:
 		/**
 		 * Bidirectional pipes that allow the Supervisor and Stem to talk.
 		 */
-		std::unique_ptr<bro::PipePair> pipe;
+		std::unique_ptr<zeek::detail::PipePair> pipe;
 		/**
 		 * The Stem's parent process ID (i.e. PID of the Supervisor).
 		 */
@@ -382,9 +382,9 @@ private:
 
 	Config config;
 	pid_t stem_pid;
-	std::unique_ptr<bro::PipePair> stem_pipe;
+	std::unique_ptr<zeek::detail::PipePair> stem_pipe;
 	int last_signal = -1;
-	bro::Flare signal_flare;
+	zeek::detail::Flare signal_flare;
 	NodeMap nodes;
 	std::string msg_buffer;
 };
diff --git a/src/threading/MsgThread.h b/src/threading/MsgThread.h
index 42ce20984f..c95a424777 100644
--- a/src/threading/MsgThread.h
+++ b/src/threading/MsgThread.h
@@ -338,7 +338,7 @@ private:
 	bool child_sent_finish; // Child thread asked to be finished.
 	bool failed;	// Set to true when a command failed.
 
-	bro::Flare flare;
+	zeek::detail::Flare flare;
 };
 
 /**