diff --git a/Foundation/src/NamedEvent_UNIX.cpp b/Foundation/src/NamedEvent_UNIX.cpp
index 5d78401bb..d0c73886c 100644
--- a/Foundation/src/NamedEvent_UNIX.cpp
+++ b/Foundation/src/NamedEvent_UNIX.cpp
@@ -57,13 +57,13 @@ NamedEventImpl::NamedEventImpl(const std::string& name):
 	std::string fileName = getFileName();
 #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
 	_sem = sem_open(fileName.c_str(), O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO, 0);
-	if ((long) _sem == (long) SEM_FAILED) 
+	if ((long) _sem == (long) SEM_FAILED)
 		throw SystemException(Poco::format("cannot create named mutex %s (sem_open() failed, errno=%d)", fileName, errno), _name);
 #else
-	int fd = open(fileName.c_str(), O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+	int fd = open(fileName.c_str(), O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 	if (fd != -1)
 		close(fd);
-	else 
+	else
 		throw SystemException(Poco::format("cannot create named event %s (lockfile)", fileName), _name);
 	key_t key = ftok(fileName.c_str(), 0);
 	if (key == -1)
@@ -128,7 +128,7 @@ void NamedEventImpl::waitImpl()
 	{
 		err = semop(_semid, &op, 1);
 	}
-	while (err && errno == EINTR); 
+	while (err && errno == EINTR);
 	if (err) throw SystemException("cannot wait for named event", _name);
 #endif
 }
diff --git a/Foundation/src/NamedMutex_UNIX.cpp b/Foundation/src/NamedMutex_UNIX.cpp
index 13677569f..26494dced 100644
--- a/Foundation/src/NamedMutex_UNIX.cpp
+++ b/Foundation/src/NamedMutex_UNIX.cpp
@@ -57,13 +57,13 @@ NamedMutexImpl::NamedMutexImpl(const std::string& name):
 	std::string fileName = getFileName();
 #if defined(sun) || defined(__APPLE__) || defined(__osf__) || defined(__QNX__) || defined(_AIX)
 	_sem = sem_open(fileName.c_str(), O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO, 1);
-	if ((long) _sem == (long) SEM_FAILED) 
+	if ((long) _sem == (long) SEM_FAILED)
 		throw SystemException(Poco::format("cannot create named mutex %s (sem_open() failed, errno=%d)", fileName, errno), _name);
 #else
-	int fd = open(fileName.c_str(), O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+	int fd = open(fileName.c_str(), O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 	if (fd != -1)
 		close(fd);
-	else 
+	else
 		throw SystemException(Poco::format("cannot create named mutex %s (lockfile)", fileName), _name);
 	key_t key = ftok(fileName.c_str(), 0);
 	if (key == -1)