diff --git a/EmulatorPkg/Unix/Host/Host.inf b/EmulatorPkg/Unix/Host/Host.inf
index d83857a1fd..33990fc20e 100644
--- a/EmulatorPkg/Unix/Host/Host.inf
+++ b/EmulatorPkg/Unix/Host/Host.inf
@@ -122,6 +122,7 @@
    GCC:*_*_IA32_ASM_FLAGS == -m32 -c -x assembler -imacros $(DEST_DIR_DEBUG)/AutoGen.h
 
    GCC:*_*_X64_DLINK_FLAGS == -o $(BIN_DIR)/Host -m64 -L/usr/X11R6/lib
+   GCC:*_GCC5_X64_DLINK_FLAGS == -flto -o $(BIN_DIR)/Host -m64 -L/usr/X11R6/lib
    GCC:*_*_X64_CC_FLAGS == -m64 -g -fshort-wchar -fno-strict-aliasing -Wall -malign-double -idirafter/usr/include -c -include $(DEST_DIR_DEBUG)/AutoGen.h -DSTRING_ARRAY_NAME=$(BASE_NAME)Strings
    GCC:*_GCC44_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
    GCC:*_GCC45_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
@@ -129,6 +130,7 @@
    GCC:*_GCC47_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
    GCC:*_GCC48_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
    GCC:*_GCC49_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))"
+   GCC:*_GCC5_X64_CC_FLAGS = "-DEFIAPI=__attribute__((ms_abi))" -flto -DUSING_LTO -Os
    GCC:*_*_X64_PP_FLAGS == -m64 -E -x assembler-with-cpp -include $(DEST_DIR_DEBUG)/AutoGen.h
    GCC:*_*_X64_ASM_FLAGS == -m64 -c -x assembler -imacros $(DEST_DIR_DEBUG)/AutoGen.h