diff --git a/Source/WebKit2/UIProcess/Launcher/gtk/ProcessLauncherGtk.cpp b/Source/WebKit2/UIProcess/Launcher/gtk/ProcessLauncherGtk.cpp
index aae4113356f0c..2ae1fdb5c929a 100644
--- a/Source/WebKit2/UIProcess/Launcher/gtk/ProcessLauncherGtk.cpp
+++ b/Source/WebKit2/UIProcess/Launcher/gtk/ProcessLauncherGtk.cpp
@@ -35,6 +35,7 @@
 #include <WebCore/ResourceHandle.h>
 #include <WebCore/RunLoop.h>
 #include <errno.h>
+#include <glib.h>
 #include <locale.h>
 #include <wtf/text/CString.h>
 #include <wtf/text/WTFString.h>