diff --git a/pdfutil.py b/pdfutil.py
index 171b730..078c70e 100755
--- a/pdfutil.py
+++ b/pdfutil.py
@@ -187,7 +187,7 @@ def mkpdf(symtab, pageblobs, colorimgs, texts, dpi):
                     max((bbox[1][0]*72.0)/dpi, (bbox[2][0]*72.0)/dpi),
                     max((bbox[2][1]*72.0)/dpi, (bbox[3][1]*72.0)/dpi)
                 )
-                fs = r.height
+                fs = round(r.height)
                 w = fitz.get_text_length(box[1], fontsize=fs)
                 pivot = fitz.Point(r.x0, r.y0)
                 matrix = fitz.Matrix(r.width/w, 1.0)