diff --git a/pyproject.toml b/pyproject.toml
index c914b91..e21d363 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "website-build-tools"
-version = "0.1.8"
+version = "0.1.9"
 description = "tools for building websites, used by defelement.org and quadraturerules.org"
 readme = "README.md"
 requires-python = ">=3.8.0"
diff --git a/test/test_markup.py b/test/test_markup.py
index 03e9d02..5ee3eb0 100644
--- a/test/test_markup.py
+++ b/test/test_markup.py
@@ -7,3 +7,7 @@
 def test_code_highlight_cpp():
     assert "#&lt;" in code_highlight("#<include>", "cpp")
     assert "#&lt;" in markup("```cpp\n#<include>\n```\n")
+
+    assert "<br />&nbsp;&nbsp;&nbsp;&nbsp;" in markup(
+        "```python\nfor i in range(10):\n    print(i)\n```\n",
+    )
diff --git a/webtools/__init__.py b/webtools/__init__.py
index ca0cfd4..77d22ac 100644
--- a/webtools/__init__.py
+++ b/webtools/__init__.py
@@ -1,3 +1,3 @@
 """Website building tools."""
 
-__version__ = "0.1.8"
+__version__ = "0.1.9"
diff --git a/webtools/code_markup.py b/webtools/code_markup.py
index ebcdfca..d5e8e08 100644
--- a/webtools/code_markup.py
+++ b/webtools/code_markup.py
@@ -16,6 +16,7 @@
 def _highlight(txt: str, comment_start: str, keywords: typing.List[str]) -> str:
     """General highlight function."""
     out = []
+    txt = txt.replace(" ", "&nbsp;")
     for line in txt.split("\n"):
         comment = ""
         if comment_start in line: