diff --git a/build/cmake/tests/gui/CMakeLists.txt b/build/cmake/tests/gui/CMakeLists.txt
index 9ef1076103..191ec360a0 100644
--- a/build/cmake/tests/gui/CMakeLists.txt
+++ b/build/cmake/tests/gui/CMakeLists.txt
@@ -197,6 +197,7 @@ set(TEST_GUI_DATA
     image/toucan_mono_255_255_255.png
     image/width-times-height-overflow.bmp
     image/width_height_32_bit_overflow.pgm
+    image/bad_truncated.gif
     intl/ja/internat.mo
     intl/ja/internat.po
     )
diff --git a/tests/test.bkl b/tests/test.bkl
index e687968c45..32494252dc 100644
--- a/tests/test.bkl
+++ b/tests/test.bkl
@@ -352,6 +352,10 @@
     <wx-data id="data-images">
         <srcdir>$(SRCDIR)/image</srcdir>
         <dstdir>image</dstdir>
+        <!--
+            Don't forget to update build/cmake/tests/gui/CMakeLists.txt when
+            adding new files here!
+         -->
         <files>
             bitfields.bmp
             bitfields-alpha.bmp