diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f161a068f..3dd61c128 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -604,6 +604,17 @@ if( WIN32 )
 	else( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" )
 		set( SYSTEM_SOURCES ${SYSTEM_SOURCES} win32/zdoom.rc )
 	endif( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" )
+
+	# [BB] Maxim Stepin's hq2x/3x/4x pixel upsampling algorithm as library. Currently only used with VC++.
+	if( MSVC )
+	set( SYSTEM_SOURCES
+		${SYSTEM_SOURCES}
+		gl/hqnx/Image.cpp
+		gl/hqnx/hq2x.cpp
+		gl/hqnx/hq3x.cpp
+		gl/hqnx/hq4x.cpp
+	)
+	endif( MSVC )
 else( WIN32 )
 	set( SYSTEM_SOURCES_DIR sdl )
 	set( SYSTEM_SOURCES ${PLAT_SDL_SOURCES} )