diff --git a/Makefile.msvc b/Makefile.msvc
index 02361fe30e..9ba52fb90a 100644
--- a/Makefile.msvc
+++ b/Makefile.msvc
@@ -19,6 +19,7 @@ HAVE_D3D11               := 1
 HAVE_D3D12               := 1
 HAVE_CG                  := 1
 HAVE_OPENGL              := 1
+HAVE_OPENGL1             := 1
 HAVE_VULKAN              := 1
 HAVE_XAUDIO              := 1
 HAVE_XINPUT              := 1