diff --git a/src/unix/linux-core.c b/src/unix/linux-core.c
index b48a1111..ae927b7e 100644
--- a/src/unix/linux-core.c
+++ b/src/unix/linux-core.c
@@ -484,12 +484,20 @@ int uv_exepath(char* buffer, size_t* size) {
 
 
 uint64_t uv_get_free_memory(void) {
-  return (uint64_t) sysconf(_SC_PAGESIZE) * sysconf(_SC_AVPHYS_PAGES);
+  struct sysinfo info;
+
+  if (sysinfo(&info) == 0)
+    return (uint64_t) info.freeram * info.mem_unit;
+  return 0;
 }
 
 
 uint64_t uv_get_total_memory(void) {
-  return (uint64_t) sysconf(_SC_PAGESIZE) * sysconf(_SC_PHYS_PAGES);
+  struct sysinfo info;
+
+  if (sysinfo(&info) == 0)
+    return (uint64_t) info.totalram * info.mem_unit;
+  return 0;
 }