diff --git a/libc/unistd/sysconf.cpp b/libc/unistd/sysconf.cpp
index d1e23c77..78005bda 100644
--- a/libc/unistd/sysconf.cpp
+++ b/libc/unistd/sysconf.cpp
@@ -38,6 +38,7 @@ extern "C" long sysconf(int name)
 	case _SC_RTSIG_MAX: return (SIGRTMAX+1) - SIGRTMIN;
 	case _SC_GETGR_R_SIZE_MAX: return -1;
 	case _SC_GETPW_R_SIZE_MAX: return -1;
+	case _SC_MONOTONIC_CLOCK: return _POSIX_MONOTONIC_CLOCK;
 	default:
 		fprintf(stderr, "%s:%u warning: %s(%i) is unsupported\n",
 		        __FILE__, __LINE__, __func__, name);