diff --git a/Source/VSProps/Base.Dolphin.props b/Source/VSProps/Base.Dolphin.props
index 7f5c2a83d4..c82ad0a074 100644
--- a/Source/VSProps/Base.Dolphin.props
+++ b/Source/VSProps/Base.Dolphin.props
@@ -44,6 +44,7 @@
       <PreprocessorDefinitions>HAS_LIBMGBA;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions>AUTOUPDATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions>HAVE_SDL2;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions Condition="'$(Steam)'=='true'">STEAM;%(PreprocessorDefinitions)</PreprocessorDefinitions>
 
       <!-- Warnings one may want to ignore when using Level4.
       4201  nonstandard extension used : nameless struct/union