diff --git a/src/os/linux/lnx_api.c b/src/os/linux/lnx_api.c
index ec0e13c..d9e5419 100644
--- a/src/os/linux/lnx_api.c
+++ b/src/os/linux/lnx_api.c
@@ -16,7 +16,7 @@
 /**
 Sleeps for a given number of microseconds.
 **/
-int bs_sleep(int microseconds) {
+unsigned long long bs_sleep(unsigned long long microseconds) {
   usleep(microseconds);
   return 0;
 }