diff --git a/libc/bionic/sysconf.cpp b/libc/bionic/sysconf.cpp
index 411c23ab0..c301b27b3 100644
--- a/libc/bionic/sysconf.cpp
+++ b/libc/bionic/sysconf.cpp
@@ -33,6 +33,7 @@
 #include <pthread.h>
 #include <stdio.h>  // For FOPEN_MAX.
 #include <sys/auxv.h>
+#include <sys/resource.h>
 #include <sys/sysconf.h>
 #include <sys/sysinfo.h>
 #include <time.h>
@@ -50,6 +51,12 @@ static bool __sysconf_has_clock(clockid_t clock_id) {
   return clock_getres(clock_id, NULL) == 0;
 }
 
+static long __sysconf_rlimit(int resource) {
+  rlimit rl;
+  getrlimit(resource, &rl);
+  return rl.rlim_cur;
+}
+
 long sysconf(int name) {
   switch (name) {
     case _SC_ARG_MAX:           return ARG_MAX;
@@ -57,13 +64,13 @@ long sysconf(int name) {
     case _SC_BC_DIM_MAX:        return _POSIX2_BC_DIM_MAX;    // Minimum requirement.
     case _SC_BC_SCALE_MAX:      return _POSIX2_BC_SCALE_MAX;  // Minimum requirement.
     case _SC_BC_STRING_MAX:     return _POSIX2_BC_STRING_MAX; // Minimum requirement.
-    case _SC_CHILD_MAX:         return CHILD_MAX;
+    case _SC_CHILD_MAX:         return __sysconf_rlimit(RLIMIT_NPROC);
     case _SC_CLK_TCK:           return static_cast<long>(getauxval(AT_CLKTCK));
     case _SC_COLL_WEIGHTS_MAX:  return _POSIX2_COLL_WEIGHTS_MAX;  // Minimum requirement.
     case _SC_EXPR_NEST_MAX:     return _POSIX2_EXPR_NEST_MAX;     // Minimum requirement.
     case _SC_LINE_MAX:          return _POSIX2_LINE_MAX;          // Minimum requirement.
     case _SC_NGROUPS_MAX:       return NGROUPS_MAX;
-    case _SC_OPEN_MAX:          return OPEN_MAX;
+    case _SC_OPEN_MAX:          return __sysconf_rlimit(RLIMIT_NOFILE);
     case _SC_PASS_MAX:          return PASS_MAX;
     case _SC_2_C_BIND:          return _POSIX2_C_BIND;
     case _SC_2_C_DEV:           return _POSIX2_C_DEV;