diff --git a/src-IL/src/il_png.c b/src-IL/src/il_png.c
index d5b627e..d5fe363 100644
--- a/src-IL/src/il_png.c
+++ b/src-IL/src/il_png.c
@@ -278,7 +278,7 @@ ILboolean readpng_get_image(ILdouble display_exponent)
 
 	// Expand low-bit-depth grayscale images to 8 bits
 	if (png_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);
 	}
 
 	// Expand RGB images with transparency to full alpha channels