diff -Nuar a/logrotate.c b/logrotate.c
--- a/logrotate.c	2012-08-01 12:56:47.000000000 +0200
+++ b/logrotate.c	2012-08-02 18:01:20.960383277 +0200
@@ -293,13 +293,19 @@
 {
     int fd;
 	struct stat sb_create;
+    char template[PATH_MAX + 1];
+    char *fname;
+    mode_t umask_value;
+    snprintf(template, PATH_MAX, "%s/logrotate_temp.XXXXXX", ourDirName(fileName));
 
-	fd = open(fileName, (flags | O_EXCL | O_NOFOLLOW),
-		(S_IRUSR | S_IWUSR) & sb->st_mode);
+    umask_value = umask(0000);
+    fname = mktemp(template);
+    fd = open(fname, (flags | O_EXCL | O_NOFOLLOW), (S_IRUSR | S_IWUSR) & sb->st_mode);
+    umask(umask_value);
 
     if (fd < 0) {
-	message(MESS_ERROR, "error creating output file %s: %s\n",
-		fileName, strerror(errno));
+	message(MESS_ERROR, "error creating unique temp file: %s\n",
+		strerror(errno));
 	return -1;
     }
     if (fchmod(fd, (S_IRUSR | S_IWUSR) & sb->st_mode)) {
@@ -328,6 +334,12 @@
 	close(fd);
 	return -1;
     }
+    if (rename(template, fileName)) {
+            message(MESS_ERROR, "error renaming temp file to %s: %s\n",
+            fileName, strerror(errno));
+            close(fd);
+            return -1;
+    }
     return fd;
 }