diff --git a/specfile/prep.py b/specfile/prep.py
index 92609d0..8ef2b9b 100644
--- a/specfile/prep.py
+++ b/specfile/prep.py
@@ -357,6 +357,10 @@ def parse(cls, section: Section) -> "Prep":
                     m.group("d"),
                     m.group("o"),
                 )
+                if delimiter == "" and option_string != "":
+                    # delimiter can't be empty unless the match is just base macro with no options
+                    buffer.append(line)
+                    continue
                 prefix += line[: m.start("m")]
                 suffix = line[m.end("o") :] + suffix
                 klass = next(
diff --git a/tests/unit/test_prep.py b/tests/unit/test_prep.py
index e6f99b7..1f6711f 100644
--- a/tests/unit/test_prep.py
+++ b/tests/unit/test_prep.py
@@ -112,13 +112,15 @@ def test_prep_parse():
             "prep",
             data=[
                 "%setup -q",
-                "# a comment",
+                "# list all patches",
+                "echo %patches",
                 "%patch0 -p1",
                 "%{!?skip_patch2:%patch2 -p2}",
                 "",
             ],
         )
     )
+    assert len(prep.macros) == 3
     assert prep.macros[0].name == "%setup"
     assert prep.macros[0].options.q
     assert prep.macros[1].name == "%patch0"
@@ -147,7 +149,7 @@ def test_prep_get_raw_section_data():
                         PatchMacro.DEFAULTS,
                     ),
                     " ",
-                    preceding_lines=["# a comment"],
+                    preceding_lines=["# list all patches", "echo %patches"],
                 ),
                 PatchMacro(
                     PatchMacro.CANONICAL_NAME + "2",
@@ -166,7 +168,8 @@ def test_prep_get_raw_section_data():
     )
     assert prep.get_raw_section_data() == [
         "%setup -q",
-        "# a comment",
+        "# list all patches",
+        "echo %patches",
         "%patch0 -p1",
         "%{!?skip_patch2:%patch2 -p2}",
         "",