diff --git a/qmake/generators/win32/msvc_nmake.cpp b/qmake/generators/win32/msvc_nmake.cpp
index 01243defd37..299b115bdc1 100644
--- a/qmake/generators/win32/msvc_nmake.cpp
+++ b/qmake/generators/win32/msvc_nmake.cpp
@@ -49,7 +49,7 @@
 
 QT_BEGIN_NAMESPACE
 
-NmakeMakefileGenerator::NmakeMakefileGenerator() : Win32MakefileGenerator(), init_flag(false)
+NmakeMakefileGenerator::NmakeMakefileGenerator() : Win32MakefileGenerator(), init_flag(false), usePCH(false)
 {
 
 }