diff --git a/libc/bionic/libc_logging.cpp b/libc/bionic/libc_logging.cpp
index cdbf723..1fb8a84 100644
--- a/libc/bionic/libc_logging.cpp
+++ b/libc/bionic/libc_logging.cpp
@@ -230,7 +230,9 @@
 /* Perform formatted output to an output target 'o' */
 template <typename Out>
 static void out_vformat(Out& o, const char* format, va_list args) {
+#if 0
     int caller_errno = errno;
+#endif
     int nn = 0;
 
     for (;;) {
@@ -379,9 +381,11 @@
         } else if (c == '%') {
             buffer[0] = '%';
             buffer[1] = '\0';
+#if 0
         } else if (c == 'm') {
             // syslog-like %m for strerror(errno).
             str = strerror(caller_errno);
+#endif
         } else {
             __assert(__FILE__, __LINE__, "conversion specifier unsupported");
         }