diff --git a/src/gallium/drivers/crocus/crocus_screen.c b/src/gallium/drivers/crocus/crocus_screen.c
index f88834a983e..24c18b2a56f 100644
--- a/src/gallium/drivers/crocus/crocus_screen.c
+++ b/src/gallium/drivers/crocus/crocus_screen.c
@@ -381,15 +381,10 @@ crocus_init_screen_caps(struct crocus_screen *screen)
    const unsigned gpu_mappable_megabytes =
       (screen->aperture_threshold) / (1024 * 1024);
 
-   const long system_memory_pages = sysconf(_SC_PHYS_PAGES);
-   const long system_page_size = sysconf(_SC_PAGE_SIZE);
-
-   if (system_memory_pages <= 0 || system_page_size <= 0) {
+   uint64_t system_memory_bytes;
+   if (!os_get_total_physical_memory(&system_memory_bytes)) {
       caps->video_memory = -1;
    } else {
-      const uint64_t system_memory_bytes =
-         (uint64_t) system_memory_pages * (uint64_t) system_page_size;
-
       const unsigned system_memory_megabytes =
          (unsigned) (system_memory_bytes / (1024 * 1024));