diff --git a/drkonqi/detachedprocessmonitor.cpp b/drkonqi/detachedprocessmonitor.cpp
index 85a87874c..8c03f508b 100644
--- a/drkonqi/detachedprocessmonitor.cpp
+++ b/drkonqi/detachedprocessmonitor.cpp
@@ -16,6 +16,7 @@
 */
 #include "detachedprocessmonitor.h"
 
+#include <errno.h>
 #include <signal.h>
 
 #include <QtCore/QTimerEvent>
diff --git a/drkonqi/systeminformation.cpp b/drkonqi/systeminformation.cpp
index 8f5fc7fe7..35e63bb75 100644
--- a/drkonqi/systeminformation.cpp
+++ b/drkonqi/systeminformation.cpp
@@ -23,6 +23,7 @@
 #include "systeminformation.h"
 
 #ifdef HAVE_UNAME
+# include <errno.h>
 # include <sys/utsname.h>
 #endif
 
diff --git a/ksmserver/screenlocker/greeter/authenticator.cpp b/ksmserver/screenlocker/greeter/authenticator.cpp
index ad60f0bd0..4d916a1ba 100644
--- a/ksmserver/screenlocker/greeter/authenticator.cpp
+++ b/ksmserver/screenlocker/greeter/authenticator.cpp
@@ -30,10 +30,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <QTimer>
 
 // system
-#include <unistd.h>
+#include <errno.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
+#include <unistd.h>
 
 Authenticator::Authenticator(QObject *parent)
     : QObject(parent)