diff --git a/sandboxed_api/sandbox2/monitor.cc b/sandboxed_api/sandbox2/monitor.cc
index 0e44d86..d3e69b6 100644
--- a/sandboxed_api/sandbox2/monitor.cc
+++ b/sandboxed_api/sandbox2/monitor.cc
@@ -440,7 +440,8 @@ void Monitor::MainLoop(sigset_t* sset) {
     } else if (WIFSTOPPED(status)) {
       VLOG(2) << "PID: " << ret
               << " received signal: " << util::GetSignalName(WSTOPSIG(status))
-              << " with event: " << __WPTRACEEVENT(status);
+              << " with event: "
+              << util::GetPtraceEventName(__WPTRACEEVENT(status));
       StateProcessStopped(ret, status);
     } else if (WIFCONTINUED(status)) {
       VLOG(2) << "PID: " << ret << " is being continued";
diff --git a/sandboxed_api/sandbox2/util.cc b/sandboxed_api/sandbox2/util.cc
index 4b8c402..8670700 100644
--- a/sandboxed_api/sandbox2/util.cc
+++ b/sandboxed_api/sandbox2/util.cc
@@ -18,6 +18,7 @@
 #include <bits/local_lim.h>
 #include <sched.h>
 #include <spawn.h>
+#include <sys/ptrace.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/uio.h>
@@ -283,6 +284,33 @@ std::string GetRlimitName(int resource) {
   }
 }
 
+std::string GetPtraceEventName(int event) {
+#if !defined(PTRACE_EVENT_STOP)
+#define PTRACE_EVENT_STOP 128
+#endif
+
+  switch (event) {
+    case PTRACE_EVENT_FORK:
+      return "PTRACE_EVENT_FORK";
+    case PTRACE_EVENT_VFORK:
+      return "PTRACE_EVENT_VFORK";
+    case PTRACE_EVENT_CLONE:
+      return "PTRACE_EVENT_CLONE";
+    case PTRACE_EVENT_EXEC:
+      return "PTRACE_EVENT_EXEC";
+    case PTRACE_EVENT_VFORK_DONE:
+      return "PTRACE_EVENT_VFORK_DONE";
+    case PTRACE_EVENT_EXIT:
+      return "PTRACE_EVENT_EXIT";
+    case PTRACE_EVENT_SECCOMP:
+      return "PTRACE_EVENT_SECCOMP";
+    case PTRACE_EVENT_STOP:
+      return "PTRACE_EVENT_STOP";
+    default:
+      return absl::StrCat("UNKNOWN: ", event);
+  }
+}
+
 absl::StatusOr<std::string> ReadCPathFromPid(pid_t pid, uintptr_t ptr) {
   std::string path(PATH_MAX, '\0');
   iovec local_iov[] = {{&path[0], path.size()}};
diff --git a/sandboxed_api/sandbox2/util.h b/sandboxed_api/sandbox2/util.h
index 0aaf8f4..95f52cc 100644
--- a/sandboxed_api/sandbox2/util.h
+++ b/sandboxed_api/sandbox2/util.h
@@ -71,6 +71,9 @@ std::string GetSignalName(int signo);
 // Returns rlimit resource name
 std::string GetRlimitName(int resource);
 
+// Returns ptrace event name
+std::string GetPtraceEventName(int event);
+
 // Reads a path string (NUL-terminated, shorter than PATH_MAX) from another
 // process memory
 absl::StatusOr<std::string> ReadCPathFromPid(pid_t pid, uintptr_t ptr);