diff --git a/src/corelib/io/qprocess_unix.cpp b/src/corelib/io/qprocess_unix.cpp
index 795229419ca..b822417ddfa 100644
--- a/src/corelib/io/qprocess_unix.cpp
+++ b/src/corelib/io/qprocess_unix.cpp
@@ -121,6 +121,10 @@ QT_BEGIN_NAMESPACE
 
 #if !defined(Q_OS_DARWIN)
 
+QT_BEGIN_INCLUDE_NAMESPACE
+extern char **environ;
+QT_END_INCLUDE_NAMESPACE
+
 QProcessEnvironment QProcessEnvironment::systemEnvironment()
 {
     QProcessEnvironment env;