diff --git a/gio/gzlibdecompressor.c b/gio/gzlibdecompressor.c
index 1587dd53a..4a3cd21f9 100644
--- a/gio/gzlibdecompressor.c
+++ b/gio/gzlibdecompressor.c
@@ -225,7 +225,6 @@ g_zlib_decompressor_convert (GConverter *converter,
 			     GError    **error)
 {
   GZlibDecompressor *decompressor;
-  gsize header_size;
   int res;
 
   decompressor = G_ZLIB_DECOMPRESSOR (converter);