diff --git a/.vscode/settings.json b/.vscode/settings.json
index 7fee802..37745ce 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,5 +1,6 @@
 {
 	"files.associations": {
-		"unistd.h": "c"
+		"unistd.h": "c",
+		"mman.h": "c"
 	}
 }
\ No newline at end of file
diff --git a/System Abstraction/linux/cdb_file.c b/System Abstraction/linux/cdb_file.c
index 7f7572d..c3e3106 100644
--- a/System Abstraction/linux/cdb_file.c	
+++ b/System Abstraction/linux/cdb_file.c	
@@ -5,6 +5,7 @@
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <sys/errno.h>
+#include <sys/file.h>
 #include <fcntl.h>
 
 struct sus_File_impl{
@@ -21,6 +22,8 @@ sus_File sus_fileOpenInMem(char * fileName, unsigned long parameter) {
 	int fd = open(fileName, flags, S_IRWXU);
 	if(fd == -1) return NULL;
 
+	flock(fd, LOCK_EX);
+
 	struct stat info;
 	if(stat(fileName, &info)) {
 		close(fd);
diff --git a/tests/System Abstraction/3/openTempFiletest b/tests/System Abstraction/3/openTempFiletest
index 9e2b918..35fefc0 100755
Binary files a/tests/System Abstraction/3/openTempFiletest and b/tests/System Abstraction/3/openTempFiletest differ