diff --git a/src/Nazara/Core/Posix/FileImpl.cpp b/src/Nazara/Core/Posix/FileImpl.cpp
index 094e15eff..5603ed79b 100644
--- a/src/Nazara/Core/Posix/FileImpl.cpp
+++ b/src/Nazara/Core/Posix/FileImpl.cpp
@@ -66,6 +66,9 @@ namespace Nz
 		if (mode & OpenMode_Append)
 			flags |= O_APPEND;
 
+		if (mode & OpenMode_MustExist)
+			flags &= ~O_CREAT;
+
 		if (mode & OpenMode_Truncate)
 			flags |= O_TRUNC;