1 files changed, 1 insertions, 1 deletions

diff --git a/src/font.c b/src/font.c
index ce7091313f6..b933007f40c 100644
--- a/src/font.c
+++ b/src/font.c
@@ -4480,7 +4480,7 @@ DEFUN ("open-font", Fopen_font, Sopen_font, 1, 3, 0,
     {
       CHECK_NUMBER_OR_FLOAT (size);
       if (FLOATP (size))
-        isize = POINT_TO_PIXEL (- isize, XFRAME (frame)->resy);
+        isize = POINT_TO_PIXEL (XFLOAT_DATA (size), XFRAME (frame)->resy);
       else
         isize = XINT (size);
       if (isize == 0)