@@ -91,10 +91,13 @@
 #endif
 
 #ifndef O_BINARY
 # define O_BINARY 0
 #endif
+#ifndef O_CLOEXEC
+# define O_CLOEXEC 0
+#endif
 #ifndef O_EXLOCK
 # define O_EXLOCK 0
 #endif
 
 #ifndef S_IRGRP
@@ -888,10 +891,12 @@
 	@try {
 		int flags;
 
 		if ((flags = parseMode([mode UTF8String])) == -1)
 			@throw [OFInvalidArgumentException exception];
+
+		flags |= O_CLOEXEC;
 
 #ifndef _WIN32
 		if ((_fd = open([path cStringWithEncoding: [OFSystemInfo
 		    native8BitEncoding]], flags, DEFAULT_MODE)) == -1)
 #else