diff --git a/src/os/linux/linux_sigar.c b/src/os/linux/linux_sigar.c
index 20adb174..67419cf4 100644
--- a/src/os/linux/linux_sigar.c
+++ b/src/os/linux/linux_sigar.c
@@ -141,6 +141,8 @@ static int sigar_boot_time_get(sigar_t *sigar)
         }
     }
 
+    fclose(fp);
+
     if (!found) {
         /* should never happen */
         sigar->boot_time = time(NULL);