diff --git a/goldendict.pro b/goldendict.pro
index 4720cb3a..f10af87d 100644
--- a/goldendict.pro
+++ b/goldendict.pro
@@ -41,6 +41,8 @@ win32 {
         VERSION = 1.5.0 # More complicated things cause errors during compilation under MSVC++
         DEFINES += __WIN32 _CRT_SECURE_NO_WARNINGS
         QMAKE_CXXFLAGS += /wd4290 # silence the warning C4290: C++ exception specification ignored
+        QMAKE_LFLAGS_RELEASE += /LTCG /OPT:REF /OPT:ICF
+        QMAKE_CXXFLAGS_RELEASE += /GL
         LIBS += -lshell32 -luser32 -lsapi -lole32 -lhunspell
         LIBS += -L$${PWD}/winlibs/lib/msvc
     } else {