diff --git a/tests/draw/test_text.py b/tests/draw/test_text.py
index 16c9cb13..aeb9c46d 100644
--- a/tests/draw/test_text.py
+++ b/tests/draw/test_text.py
@@ -715,6 +715,29 @@ def test_zero_width_character():
       <div>a&zwnj;b</div>''')
 
 
+def test_font_size_very_small():
+    assert_pixels('font_size_very_small', 10, 4, '''
+        __________
+        __________
+        __________
+        __________
+    ''', '''
+      <style>
+        @font-face {src: url(weasyprint.otf); font-family: weasyprint}
+        @page {
+          size: 10px 4px;
+          background: white;
+          margin: 1px;
+        }
+        body {
+          font-family: weasyprint;
+          font-size: 0.00000001px;
+        }
+      </style>
+      test font size zero
+    ''')
+
+
 def test_tabulation_character():
     # Test regression: https://github.com/Kozea/WeasyPrint/issues/1515
     assert_pixels('zero_width_character', 10, 4, '''
diff --git a/weasyprint/draw.py b/weasyprint/draw.py
index c9e16a48..e819dd56 100644
--- a/weasyprint/draw.py
+++ b/weasyprint/draw.py
@@ -1030,6 +1030,10 @@ def draw_emojis(stream, font_size, x, y, emojis):
 def draw_first_line(stream, textbox, text_overflow, block_ellipsis, x, y,
                     angle=0):
     """Draw the given ``textbox`` line to the document ``stream``."""
+    font_size = textbox.style['font_size']
+    if font_size < 1e-6:  # Default float precision used by pydyf
+        return []
+
     pango.pango_layout_set_single_paragraph_mode(
         textbox.pango_layout.layout, True)
 
@@ -1072,7 +1076,6 @@ def draw_first_line(stream, textbox, text_overflow, block_ellipsis, x, y,
             textbox.pango_layout.set_text(new_text + ellipsis)
             first_line, index = textbox.pango_layout.get_first_line()
 
-    font_size = textbox.style['font_size']
     utf8_text = textbox.pango_layout.text.encode()
     previous_utf8_position = 0