diff --git a/winbuild/MakefileBuild.vc b/winbuild/MakefileBuild.vc
index 6f34257c5..4e39be66f 100644
--- a/winbuild/MakefileBuild.vc
+++ b/winbuild/MakefileBuild.vc
@@ -222,6 +222,9 @@ CARES          = static
 
 !IFDEF USE_CARES
 CARES_CFLAGS   = /DUSE_ARES /I"$(CARES_INC_DIR)"
+!IF "$(CARES)"=="static"
+CARES_CFLAGS   = $(CARES_CFLAGS) /DCARES_STATICLIB
+!ENDIF
 !ENDIF