diff --git a/ttd.dsp b/ttd.dsp
index cd491230ae..4b2aef0b35 100644
--- a/ttd.dsp
+++ b/ttd.dsp
@@ -470,6 +470,10 @@ SOURCE=.\macros.h
 # End Source File
 # Begin Source File
 
+SOURCE=.\md5.h
+# End Source File
+# Begin Source File
+
 SOURCE=.\network.h
 # End Source File
 # Begin Source File
diff --git a/ttd.vcproj b/ttd.vcproj
index 5d556078ef..0c93a1ffe3 100644
--- a/ttd.vcproj
+++ b/ttd.vcproj
@@ -1166,6 +1166,9 @@
 			<File
 				RelativePath="macros.h">
 			</File>
+			<File
+				RelativePath="md5.h">
+			</File>
 			<File
 				RelativePath=".\network.h">
 			</File>