diff --git a/DevTools/UserspaceEmulator/Emulator.cpp b/DevTools/UserspaceEmulator/Emulator.cpp
index 59a7c300ec..f9f36ca327 100644
--- a/DevTools/UserspaceEmulator/Emulator.cpp
+++ b/DevTools/UserspaceEmulator/Emulator.cpp
@@ -217,12 +217,11 @@ void Emulator::dump_backtrace(const Vector<FlatPtr>& backtrace)
         u32 offset = 0;
         String symbol = m_elf->symbolicate(address, &offset);
         auto source_position = m_debug_info->get_source_position(address);
-        report("==%d==    %#08x  %s", getpid(), address, symbol.characters());
+        new_warn("=={}==    {:p}  {}", getpid(), address, symbol);
         if (source_position.has_value())
-            report(" (\033[34;1m%s\033[0m:%zu)", LexicalPath(source_position.value().file_path).basename().characters(), source_position.value().line_number);
+            warnln(" (\033[34;1m{}\033[0m:{})", LexicalPath(source_position.value().file_path).basename(), source_position.value().line_number);
         else
-            report(" +%#x", offset);
-        report("\n");
+            warnln(" +{:x}", offset);
     }
 }
 
@@ -897,7 +896,7 @@ u32 Emulator::virt$read(int fd, FlatPtr buffer, ssize_t size)
 
 void Emulator::virt$exit(int status)
 {
-    report("\n==%d==  \033[33;1mSyscall: exit(%d)\033[0m, shutting down!\n", getpid(), status);
+    warnln("\n=={}==  \033[33;1mSyscall: exit({})\033[0m, shutting down!", getpid(), status);
     m_exit_status = status;
     m_shutdown = true;
 }
@@ -1239,14 +1238,6 @@ void Emulator::dispatch_one_pending_signal()
     m_cpu.set_eip(m_signal_trampoline);
 }
 
-void report(const char* format, ...)
-{
-    va_list ap;
-    va_start(ap, format);
-    vfprintf(stderr, format, ap);
-    va_end(ap);
-}
-
 // Make sure the compiler doesn't "optimize away" this function:
 extern void signal_trampoline_dummy(void);
 void signal_trampoline_dummy(void)
diff --git a/DevTools/UserspaceEmulator/Emulator.h b/DevTools/UserspaceEmulator/Emulator.h
index b597da05d1..e2f8ff5a20 100644
--- a/DevTools/UserspaceEmulator/Emulator.h
+++ b/DevTools/UserspaceEmulator/Emulator.h
@@ -171,6 +171,4 @@ private:
     FlatPtr m_signal_trampoline { 0 };
 };
 
-void report(const char*, ...);
-
 }
diff --git a/DevTools/UserspaceEmulator/SoftCPU.cpp b/DevTools/UserspaceEmulator/SoftCPU.cpp
index bc7352729c..dbedd5effc 100644
--- a/DevTools/UserspaceEmulator/SoftCPU.cpp
+++ b/DevTools/UserspaceEmulator/SoftCPU.cpp
@@ -36,7 +36,7 @@
 
 #define TODO_INSN()                                                                 \
     do {                                                                            \
-        report("\n==%d== Unimplemented instruction: %s\n", getpid(), __FUNCTION__); \
+        warnln("\n=={}== Unimplemented instruction: {}\n", getpid(), __FUNCTION__); \
         m_emulator.dump_backtrace();                                                \
         _exit(0);                                                                   \
     } while (0)
diff --git a/DevTools/UserspaceEmulator/main.cpp b/DevTools/UserspaceEmulator/main.cpp
index 7afef62b10..7b5dfbf596 100644
--- a/DevTools/UserspaceEmulator/main.cpp
+++ b/DevTools/UserspaceEmulator/main.cpp
@@ -78,7 +78,7 @@ int main(int argc, char** argv, char** env)
     }
     int rc = pthread_setname_np(pthread_self(), builder.to_string().characters());
     if (rc != 0) {
-        fprintf(stderr, "pthread_setname_np: %s\n", strerror(rc));
+        warnln("pthread_setname_np: {}", strerror(rc));
         return 1;
     }
     return emulator.exec();