diff --git a/src/corelib/io/qprocess_unix.cpp b/src/corelib/io/qprocess_unix.cpp
index 7a9e75d5340..fcb0c4b47c5 100644
--- a/src/corelib/io/qprocess_unix.cpp
+++ b/src/corelib/io/qprocess_unix.cpp
@@ -467,6 +467,18 @@ bool QProcessPrivate::createChannel(Channel &channel)
     }
 }
 
+QT_BEGIN_INCLUDE_NAMESPACE
+#if defined(Q_OS_MAC) && !defined(QT_NO_CORESERVICES)
+# include <crt_externs.h>
+# define environ (*_NSGetEnviron())
+#elif defined(Q_OS_SYMBIAN) || (defined(Q_OS_MAC) && defined(QT_NO_CORESERVICES))
+  static char *qt_empty_environ[] = { 0 };
+#define environ qt_empty_environ
+#else
+  extern char **environ;
+#endif
+QT_END_INCLUDE_NAMESPACE
+
 QProcessEnvironment QProcessEnvironment::systemEnvironment()
 {
     QProcessEnvironment env;