diff --git a/libbalsa/misc.c b/libbalsa/misc.c
index d892a28..0116cf4 100644
--- a/libbalsa/misc.c
+++ b/libbalsa/misc.c
@@ -1451,13 +1451,12 @@ libbalsa_font_string_to_css(const gchar * font_string,
             g_string_append_printf(string, "font-stretch: %s;\n", stretch);
     }
     if (mask & PANGO_FONT_MASK_SIZE) {
-        gint size;
+        gdouble size;
+        const gchar *units;
 
-        size = pango_font_description_get_size(desc);
-        if (!pango_font_description_get_size_is_absolute(desc))
-            size *= gdk_screen_get_resolution(gdk_screen_get_default()) / 72;
-        size = PANGO_PIXELS(size);
-        g_string_append_printf(string, "font-size: %dpx;\n", size);
+        size = (gdouble) pango_font_description_get_size(desc) / PANGO_SCALE;
+        units = pango_font_description_get_size_is_absolute(desc) ? "px" : "pt";
+        g_string_append_printf(string, "font-size: %.1f%s;\n", size, units);
     }
     g_string_append_c(string, '}');