diff --git a/configure.in b/configure.in
index 670820bb6..e065a1836 100644
--- a/configure.in
+++ b/configure.in
@@ -158,6 +158,8 @@ else
 	AC_C_BIGENDIAN
 fi
 
+AC_CHECK_FUNCS(usleep)
+
 AC_MSG_CHECKING(for fnmatch)
 AC_TRY_LINK(
 	[],
diff --git a/qw/source/cl_main.c b/qw/source/cl_main.c
index a9f96e45c..68ddfb088 100644
--- a/qw/source/cl_main.c
+++ b/qw/source/cl_main.c
@@ -1452,8 +1452,10 @@ Host_Frame (float time)
 
 	// decide the simulation time
 	if ((sleeptime = Host_SimulationTime (time)) != 0) {
+#ifdef HAVE_USLEEP
 		if (sleeptime > 0.01) // minimum sleep time
 			usleep((unsigned long)((sleeptime - 0.001) * 1000000));
+#endif
 		return;					// framerate is too high
 	}