diff --git a/aegisub/build/msbuild/csrihelper/csrihelper.vcxproj b/aegisub/build/msbuild/csrihelper/csrihelper.vcxproj
index ef6b76a13..0122c2e9f 100644
--- a/aegisub/build/msbuild/csrihelper/csrihelper.vcxproj
+++ b/aegisub/build/msbuild/csrihelper/csrihelper.vcxproj
@@ -46,7 +46,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
-      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>CSRI_NO_EXPORT;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(SrcDir)include\;$(SrcDir)lib\;$(SrcDir)lib\win32\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
   </ItemDefinitionGroup>
diff --git a/contrib/csri/include/visibility.h b/contrib/csri/include/visibility.h
index 632f07ef2..c994ac681 100644
--- a/contrib/csri/include/visibility.h
+++ b/contrib/csri/include/visibility.h
@@ -26,7 +26,7 @@
 #include "acconf.h"
 #endif
 
-#ifdef _WIN32
+#if defined(_WIN32) && !defined(CSRI_NO_EXPORT)
 #define export __declspec(dllexport)
 #define internal
 #define hidden