diff --git a/ChangeLog b/ChangeLog
index d755c04b4..70a080578 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2020-07-23  Werner Lemberg  <wl@gnu.org>
+
+	* src/sfnt/sfwoff2.c (woff2_decompress): Fix compiler warning.
+
+	Reported by Hin-Tak.
+
 2020-07-12  Werner Lemberg  <wl@gnu.org>
 
 	* builds/unix/configure.raw: Fix inclusion of `ftoption.h'.
diff --git a/src/sfnt/sfwoff2.c b/src/sfnt/sfwoff2.c
index 895d6cf49..30345c775 100644
--- a/src/sfnt/sfwoff2.c
+++ b/src/sfnt/sfwoff2.c
@@ -318,7 +318,9 @@
   {
 #ifdef FT_CONFIG_OPTION_USE_BROTLI
 
-    FT_ULong             uncompressed_size = dst_size;
+    /* this cast is only of importance on 32bit systems; */
+    /* we don't validate it                              */
+    FT_Offset            uncompressed_size = (FT_Offset)dst_size;
     BrotliDecoderResult  result;