diff --git a/src/common.cpp b/src/common.cpp
index 0c746e6e3..2c275c4ef 100644
--- a/src/common.cpp
+++ b/src/common.cpp
@@ -95,8 +95,6 @@ const wchar_t *program_name;
 /// This is set during startup and not modified after.
 static relaxed_atomic_t<pid_t> initial_fg_process_group{-1};
 
-static void debug_shared(wchar_t msg_level, const wcstring &msg);
-
 #if defined(OS_IS_CYGWIN) || defined(WSL)
 // MS Windows tty devices do not currently have either a read or write timestamp. Those
 // respective fields of `struct stat` are always the current time. Which means we can't
@@ -224,17 +222,17 @@ bool is_windows_subsystem_for_linux() {
     return backtrace_text;
 }
 
-[[gnu::noinline]] void show_stackframe(const wchar_t msg_level, int frame_count, int skip_levels) {
+[[gnu::noinline]] void show_stackframe(int frame_count, int skip_levels) {
     if (frame_count < 1) return;
 
     wcstring_list_t bt = demangled_backtrace(frame_count, skip_levels + 2);
-    debug_shared(msg_level, L"Backtrace:\n" + join_strings(bt, L'\n') + L'\n');
+    FLOG(error, L"Backtrace:\n" + join_strings(bt, L'\n') + L'\n');
 }
 
 #else   // HAVE_BACKTRACE_SYMBOLS
 
-[[gnu::noinline]] void show_stackframe(const wchar_t msg_level, int, int) {
-    debug_shared(msg_level, L"Sorry, but your system does not support backtraces");
+[[gnu::noinline]] void show_stackframe(int, int) {
+    FLOGF(error, L"Sorry, but your system does not support backtraces");
 }
 #endif  // HAVE_BACKTRACE_SYMBOLS
 
@@ -606,17 +604,6 @@ bool should_suppress_stderr_for_tests() {
     return program_name && !std::wcscmp(program_name, TESTS_PROGRAM_NAME);
 }
 
-static void debug_shared(const wchar_t level, const wcstring &msg) {
-    pid_t current_pid;
-    if (!is_forked_child()) {
-        std::fwprintf(stderr, L"<%lc> %ls: %ls\n", level, program_name, msg.c_str());
-    } else {
-        current_pid = getpid();
-        std::fwprintf(stderr, L"<%lc> %ls: %d: %ls\n", level, program_name, current_pid,
-                      msg.c_str());
-    }
-}
-
 // Careful to not negate LLONG_MIN.
 static unsigned long long absolute_value(long long x) {
     if (x >= 0) return static_cast<unsigned long long>(x);
@@ -1833,7 +1820,7 @@ void redirect_tty_output() {
     } else {
         FLOGF(error, L"%s:%zu: failed assertion: %s", file, line, msg);
     }
-    show_stackframe(L'E', 99, 1);
+    show_stackframe(99, 1);
     abort();
 }
 
diff --git a/src/common.h b/src/common.h
index 808e939cc..88ac55627 100644
--- a/src/common.h
+++ b/src/common.h
@@ -196,7 +196,7 @@ extern const wcstring g_empty_string;
 #define FATAL_EXIT()                                \
     do {                                            \
         char exit_read_buff;                        \
-        show_stackframe(L'E');                      \
+        show_stackframe();                          \
         ignore_result(read(0, &exit_read_buff, 1)); \
         exit_without_destructors(1);                \
     } while (0)
@@ -276,7 +276,7 @@ std::shared_ptr<T> move_to_sharedptr(T &&v) {
 using cancel_checker_t = std::function<bool()>;
 
 /// Print a stack trace to stderr.
-void show_stackframe(const wchar_t msg_level, int frame_count = 100, int skip_levels = 0);
+void show_stackframe(int frame_count = 100, int skip_levels = 0);
 
 /// Returns a  wide character string equivalent of the specified multibyte character string.
 ///