diff --git a/libpolyml/PolyLib.vcxproj b/libpolyml/PolyLib.vcxproj
index 15ec3ede..949fefb4 100644
--- a/libpolyml/PolyLib.vcxproj
+++ b/libpolyml/PolyLib.vcxproj
@@ -1,893 +1,896 @@
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+  <ItemGroup>
+    <None Include="cpp.hint" />
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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 </Project>
\ No newline at end of file
diff --git a/libpolyml/cpp.hint b/libpolyml/cpp.hint
new file mode 100644
index 00000000..dfcb10ad
--- /dev/null
+++ b/libpolyml/cpp.hint
@@ -0,0 +1,5 @@
+// Hint files help the Visual Studio IDE interpret Visual C++ identifiers
+// such as names of functions and macros.
+// For more information see https://go.microsoft.com/fwlink/?linkid=865984
+#define POLYEXTERNALSYMBOL __declspec(dllexport)
+#define POLYEXTERNALSYMBOL