diff --git a/src/IKVM.Clang.Sdk.Tests/Project/Executable/main.c b/src/IKVM.Clang.Sdk.Tests/Project/Executable/main.c
index ae6f546..d113b26 100644
--- a/src/IKVM.Clang.Sdk.Tests/Project/Executable/main.c
+++ b/src/IKVM.Clang.Sdk.Tests/Project/Executable/main.c
@@ -12,6 +12,8 @@ int main() {
 #endif
 }
 
+#ifdef EMSCRIPTEN
 int exit() {
     return 0;
 }
+#endif
diff --git a/src/IKVM.Clang.Sdk.Tests/Project/lib.props b/src/IKVM.Clang.Sdk.Tests/Project/lib.props
index df0a07a..a4cc405 100644
--- a/src/IKVM.Clang.Sdk.Tests/Project/lib.props
+++ b/src/IKVM.Clang.Sdk.Tests/Project/lib.props
@@ -103,6 +103,7 @@
         <SystemRootDirectories Include="$(EMSDK)\upstream\emscripten\cache\sysroot" />
         <SystemIncludeDirectories Include="$(EMSDK)\upstream\emscripten\cache\sysroot\include" />
         <LibraryDirectories Include="$(EMSDK)\upstream\emscripten\cache\sysroot\lib" />
+        <PreprocessorDefinitions Include="EMSCRIPTEN" />
         <Dependencies Include="embind" />
     </ItemGroup>