diff --git a/po/POTFILES.in b/po/POTFILES.in
index a45dc48ab..86bf3a889 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -260,7 +260,7 @@ src/loop.c
 src/main.c
 src/map.c
 src/mapdisplay.c
-src/mapgrid.c
+src/mapgrid.cpp
 src/mechanics.c
 src/message.c
 src/miscimd.c
@@ -282,6 +282,7 @@ src/objmem.c
 src/oprint.c
 src/order.c
 src/parsetest.c
+src/pointtree.cpp
 src/power.c
 src/projectile.c
 src/radar.c
diff --git a/warzone2100.cbp b/warzone2100.cbp
index d4f246619..208b85ec5 100644
--- a/warzone2100.cbp
+++ b/warzone2100.cbp
@@ -2174,7 +2174,7 @@
 			<Option target="DBGWindows" />
 			<Option target="NDBGWindows" />
 		</Unit>
-		<Unit filename="src/mapgrid.c">
+		<Unit filename="src/mapgrid.cpp">
 			<Option compilerVar="CC" />
 			<Option target="DBGUnix" />
 			<Option target="NDBGUnix" />