@@ -105,13 +105,19 @@
 {
 	if (sec < 0)
 		@throw [OFOutOfRangeException newWithClass: self];
 
 #ifndef _WIN32
-	sleep(sec);
+	if (sec > UINT_MAX)
+		@throw [OFOutOfRangeException newWithClass: self];
+
+	sleep((unsigned int)sec);
 #else
-	Sleep(sec * 1000);
+	if (sec * 1000 > UINT_MAX)
+		@throw [OFOutOfRangeException newWithClass: self];
+
+	Sleep((unsigned int)sec * 1000);
 #endif
 }
 
 + (void)sleepForTimeInterval: (int64_t)sec
 		microseconds: (uint32_t)usec
@@ -118,14 +124,17 @@
 {
 	if (sec < 0)
 		@throw [OFOutOfRangeException newWithClass: self];
 
 #ifndef _WIN32
-	sleep(sec);
+	sleep((unsigned int)sec);
 	usleep(usec);
 #else
-	Sleep(sec * 1000 + usec / 1000);
+	if (sec * 1000 + usec / 1000 > UINT_MAX)
+		@throw [OFOutOfRangeException newWithClass: self];
+
+	Sleep((unsigned int)sec * 1000 + usec / 1000);
 #endif
 }
 
 + (void)sleepUntilDate: (OFDate*)date
 {
@@ -140,13 +149,19 @@
 	usec = [date microsecondsOfTimeIntervalSinceDate: now];
 
 	[pool release];
 
 #ifndef _WIN32
-	sleep(sec);
+	if (sec > UINT_MAX)
+		@throw [OFOutOfRangeException newWithClass: self];
+
+	sleep((unsigned int)sec);
 	usleep(usec);
 #else
+	if (sec * 1000 + usec / 1000 > UINT_MAX)
+		@throw [OFOutOfRangeException newWithClass: self];
+
 	Sleep(sec * 1000 + usec / 1000);
 #endif
 }
 
 + (void)yield