diff --git a/src/LyX.cpp b/src/LyX.cpp
index 17094dab31..0633bcbd54 100644
--- a/src/LyX.cpp
+++ b/src/LyX.cpp
@@ -74,6 +74,8 @@
 #include <string>
 #include <vector>
 
+#include <qglobal.h> // For QT_VERSION
+
 using namespace std;
 using namespace lyx::support;