diff --git a/CHANGES b/CHANGES
index e18a757..48dce6e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -12,6 +12,8 @@ Corrections:
 	quotes
 	Test: UNBALANCED_QUOTE
 
+	Removed unused usleep() call from sycls.c
+
 Porting:
 	In gcc version 10 the default changed from -fcommon to -fno-common.
 	Consequently, linking filan and procan failed with error
diff --git a/sycls.c b/sycls.c
index 9d30a6e..0767f57 100644
--- a/sycls.c
+++ b/sycls.c
@@ -1329,14 +1329,6 @@ unsigned int Sleep(unsigned int seconds) {
    return retval;
 }
 
-/* obsolete by POSIX.1-2001 */
-void Usleep(unsigned long usec) {
-   Debug1("usleep(%lu)", usec);
-   usleep(usec);
-   Debug("usleep() ->");
-   return;
-}
-
 #if HAVE_NANOSLEEP
 unsigned int Nanosleep(const struct timespec *req, struct timespec *rem) {
    int retval, _errno;
diff --git a/sycls.h b/sycls.h
index 57eb994..2d5e706 100644
--- a/sycls.h
+++ b/sycls.h
@@ -134,7 +134,6 @@ int Shutdown(int fd, int how);
 #endif /* _WITH_SOCKET */
 #if WITH_SYCLS
 unsigned int Sleep(unsigned int seconds);
-void Usleep(unsigned long usec);
 unsigned int Nanosleep(const struct timespec *req, struct timespec *rem);
 int Pause(void);
 struct hostent *Gethostbyname(const char *name);
@@ -242,7 +241,6 @@ void Add_history(const char *string);
 #define Setsockopt(s,d,n,v,l) setsockopt(s,d,n,v,l)
 #define Shutdown(f,h) shutdown(f,h)
 #define Sleep(s) sleep(s)
-#define Usleep(u) usleep(u)
 #define Nanosleep(req,rem) nanosleep(req,rem)
 #define Pause() pause()
 #define Gethostbyname(n) gethostbyname(n)