diff --git a/celestia/src/celengine/image.cpp b/celestia/src/celengine/image.cpp

index 4aa57f1..08ca60d 100644

--- a/celestia/src/celengine/image.cpp

+++ b/celestia/src/celengine/image.cpp

@@ -739,7 +739,7 @@ Image* LoadPNGImage(const string& filename)

     if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)

     {

-        png_set_gray_1_2_4_to_8(png_ptr);

+        png_set_expand_gray_1_2_4_to_8(png_ptr);

     }

     if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))

diff --git a/celestia/src/celestia/imagecapture.cpp b/celestia/src/celestia/imagecapture.cpp

index 92602da..f0f5f38 100644

--- a/celestia/src/celestia/imagecapture.cpp

+++ b/celestia/src/celestia/imagecapture.cpp

@@ -8,6 +8,7 @@

 // of the License, or (at your option) any later version.

 #include <cstdio>

+#include <zlib.h>

 #include <celutil/debug.h>

 #include "../celengine/gl.h"

 #include <celengine/celestia.h>