diff --git a/contrib/libtests/readpng.c b/contrib/libtests/readpng.c
index 322b5d1837..8c721aa3ea 100644
--- a/contrib/libtests/readpng.c
+++ b/contrib/libtests/readpng.c
@@ -34,7 +34,7 @@ read_png(FILE *fp)
 {
    png_struct *png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
    png_info *info_ptr = NULL;
-   png_byte *row = NULL, display = NULL;
+   png_byte *row = NULL, *display = NULL;
 
    if (png_ptr == NULL)
       return 0;
diff --git a/contrib/libtests/timepng.c b/contrib/libtests/timepng.c
index d92e7014bf..d4cdbfff2f 100644
--- a/contrib/libtests/timepng.c
+++ b/contrib/libtests/timepng.c
@@ -84,7 +84,7 @@ static void read_by_row(png_struct *png_ptr, png_info *info_ptr,
    /* These don't get freed on error, this is fine; the program immediately
     * exits.
     */
-   png_byte *row = NULL, display = NULL;
+   png_byte *row = NULL, *display = NULL;
    io_data io_copy;
 
    if (write_ptr != NULL)