diff --git a/src/main/java/net/sourceforge/tess4j/Tesseract1.java b/src/main/java/net/sourceforge/tess4j/Tesseract1.java
index ab474c2..ee4657f 100644
--- a/src/main/java/net/sourceforge/tess4j/Tesseract1.java
+++ b/src/main/java/net/sourceforge/tess4j/Tesseract1.java
@@ -547,7 +547,7 @@ protected void setImage(RenderedImage image) throws IOException {
      */
     protected void setImage(int xsize, int ysize, ByteBuffer buf, int bpp) {
         int bytespp = bpp / 8;
-        int bytespl = (int) Math.ceil(xsize * bpp / 8.0);
+        int bytespl = buf.capacity() / ysize;
         TessBaseAPISetImage(handle, buf, xsize, ysize, bytespp, bytespl);
     }