diff --git a/protocols/vnc/configure.in b/protocols/vnc/configure.in
index 35d8c3fa..45a766e4 100644
--- a/protocols/vnc/configure.in
+++ b/protocols/vnc/configure.in
@@ -19,6 +19,7 @@ AC_CHECK_HEADERS([stdlib.h string.h syslog.h guacamole/client.h guacamole/guacio
 
 # Checks for library functions.
 AC_FUNC_MALLOC
+AC_CHECK_FUNCS([nanosleep])
 
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
diff --git a/protocols/vnc/src/vnc_client.c b/protocols/vnc/src/vnc_client.c
index 2a7af194..397a42c8 100644
--- a/protocols/vnc/src/vnc_client.c
+++ b/protocols/vnc/src/vnc_client.c
@@ -219,7 +219,7 @@ void guac_vnc_cut_text(rfbClient* client, const char* text, int textlen) {
 
 void vnc_guac_client_sleep(int millis) {
 
-#ifdef nanosleep
+#ifdef HAVE_NANOSLEEP 
         struct timespec sleep_period;
 
         sleep_period.tv_sec = 0;