diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index f5f7f73c..2aa4d3f7 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -417,6 +417,8 @@ int sigar_swap_get(sigar_t *sigar, sigar_swap_t *swap)
     char swapfile[SSTRLEN(VM_DIR) + SSTRLEN("/") + SSTRLEN(SWAPFILE) + 12];
     struct stat swapstat;
     struct statfs vmfs;
+    int status;
+    vm_statistics_data_t vmstat;
 
     swap->used = swap->total = swap->free = 0;
 
@@ -464,7 +466,11 @@ int sigar_swap_get(sigar_t *sigar, sigar_swap_t *swap)
 
     swap->free = swap->total - swap->used;
 
-    swap->page_in = swap->page_out = -1;
+    if ((status = sigar_vmstat(sigar, &vmstat)) != SIGAR_OK) {
+        return status;
+    }
+    swap->page_in = vmstat.pageins;
+    swap->page_out = vmstat.pageouts;
 #elif defined(__FreeBSD__)
     struct kvm_swap kswap[1];