diff --git a/build/bakefiles/tiff.bkl b/build/bakefiles/tiff.bkl
index 540313aa4c..a7edeedb1b 100644
--- a/build/bakefiles/tiff.bkl
+++ b/build/bakefiles/tiff.bkl
@@ -19,6 +19,7 @@
     <set var="TIFF_PLATFORM_SRC">
         <if cond="PLATFORM_UNIX=='1'">src/tiff/tif_unix.c</if>
         <if cond="PLATFORM_MACOSX=='1'">src/tiff/tif_unix.c</if>
+        <if cond="PLATFORM_OS2=='1'">src/tiff/tif_unix.c</if>
         <if cond="PLATFORM_WIN32=='1'">src/tiff/tif_win32.c</if>
     </set>