diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index 4f12fd0..645aefa 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -884,7 +884,7 @@
 
 void perror(const char* msg) {
   if (msg == nullptr) msg = "";
-  fprintf(stderr, "%s%s%s\n", msg, (*msg == '\0') ? "" : ": ", strerror(errno));
+  fprintf(stderr, "%s%s%m\n", msg, (*msg == '\0') ? "" : ": ");
 }
 
 int printf(const char* fmt, ...) {