diff --git a/src/libpisp/common/pisp_utils.cpp b/src/libpisp/common/pisp_utils.cpp
index 9ecdb0d..c64c7b6 100644
--- a/src/libpisp/common/pisp_utils.cpp
+++ b/src/libpisp/common/pisp_utils.cpp
@@ -67,7 +67,8 @@ void compute_stride_align(pisp_image_format_config &config, int align)
 	if (PISP_IMAGE_FORMAT_compressed(config.format))
 		width = (width + 7) & ~7; // compression uses blocks of 8 samples
 
-	config.stride = compute_x_offset(config.format, width);
+	if (!config.stride)
+		config.stride = compute_x_offset(config.format, width);
 	config.stride2 = 0;
 
 	if (!PISP_IMAGE_FORMAT_HOG(config.format))