diff --git a/openttd.dsp b/openttd.dsp
--- a/openttd.dsp
+++ b/openttd.dsp
@@ -147,6 +147,10 @@ SOURCE=.\aystar.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\bridge_map.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\command.c
 # End Source File
 # Begin Source File
diff --git a/openttd.vcproj b/openttd.vcproj
--- a/openttd.vcproj
+++ b/openttd.vcproj
@@ -167,6 +167,9 @@
 				RelativePath=".\aystar.c">
 			</File>
 			<File
+				RelativePath=".\bridge_map.c">
+			</File>
+			<File
 				RelativePath=".\callback_table.c">
 			</File>
 			<File