diff --git a/import_all_modules.py b/import_all_modules.py
index 7536133..5788b8c 100644
--- a/import_all_modules.py
+++ b/import_all_modules.py
@@ -39,6 +39,10 @@ def read_modules_from_cli(argv):
     # we need to unify the output to a list of particular elements
     modules_as_str = ' '.join(argv)
     modules = re.split(r'[\s,]+', modules_as_str)
+    # Because of shell expansion in some less typical cases it may happen
+    # that a trailing space will occur at the end of the list.
+    # Remove the empty items from the list before passing it further
+    modules = [m for m in modules if m]
     return modules
 
 
diff --git a/macros.python b/macros.python
index f0821d3..9f05dae 100644
--- a/macros.python
+++ b/macros.python
@@ -77,8 +77,11 @@
   PATH="%{buildroot}%{_bindir}:$PATH"\\\
   PYTHONPATH="${PYTHONPATH:-%{buildroot}%{python_sitearch}:%{buildroot}%{python_sitelib}}"\\\
   PYTHONDONTWRITEBYTECODE=1\\\
-  %{__python} -%{py_shebang_flags} %{_rpmconfigdir}/redhat/import_all_modules.py %{?**}
-}
+  %{__python} -%{py_shebang_flags} %{_rpmconfigdir}/redhat/import_all_modules.py\\\
+  %{lua:
+  -- handle multiline arguments correctly, see https://bugzilla.redhat.com/2018809
+  local args=rpm.expand('%{?**}'):gsub("[%s\\\\]*%s+", " ");print(args)
+  }}
 
 %python_provide() %{lua:
   local python = require "fedora.srpm.python"
diff --git a/macros.python3 b/macros.python3
index ddc9d4b..a4a990e 100644
--- a/macros.python3
+++ b/macros.python3
@@ -75,8 +75,11 @@
   PATH="%{buildroot}%{_bindir}:$PATH"\\\
   PYTHONPATH="${PYTHONPATH:-%{buildroot}%{python3_sitearch}:%{buildroot}%{python3_sitelib}}"\\\
   PYTHONDONTWRITEBYTECODE=1\\\
-  %{__python3} -%{py3_shebang_flags} %{_rpmconfigdir}/redhat/import_all_modules.py %{?**}
-}
+  %{__python3} -%{py3_shebang_flags} %{_rpmconfigdir}/redhat/import_all_modules.py\\\
+  %{lua:
+  -- handle multiline arguments correctly, see https://bugzilla.redhat.com/2018809
+  local args=rpm.expand('%{?**}'):gsub("[%s\\\\]*%s+", " ");print(args)
+  }}
 
 # This only supports Python 3.5+ and will never work with Python 2.
 # Hence, it has no Python version in the name.
diff --git a/python-rpm-macros.spec b/python-rpm-macros.spec
index 94ae1fb..5442c19 100644
--- a/python-rpm-macros.spec
+++ b/python-rpm-macros.spec
@@ -1,6 +1,6 @@
 Name:           python-rpm-macros
 Version:        3.9
-Release:        19%{?dist}
+Release:        20%{?dist}
 Summary:        The common Python RPM macros
 
 # macros and lua: MIT, compileall2.py: PSFv2, import_all_modules.py: MIT
@@ -110,6 +110,10 @@ install -m 644 import_all_modules.py %{buildroot}%{_rpmconfigdir}/redhat/
 
 
 %changelog
+* Mon Nov 01 2021 Karolina Surma <ksurma@redhat.com> - 3.9-20
+- Fix multiline arguments processing for %%py_check_import
+Resolves: rhbz#2018809
+
 * Wed Oct 27 2021 Karolina Surma <ksurma@redhat.com> - 3.9-19
 - Introduce -f (read from file) option to %%py{3}_check_import
 - Introduce -t (filter top-level modules) option to %%py{3}_check_import
diff --git a/tests/test_evals.py b/tests/test_evals.py
index 0174449..07e06e4 100644
--- a/tests/test_evals.py
+++ b/tests/test_evals.py
@@ -622,20 +622,22 @@ def test_python3_sitearch_value(lib):
 
 
 @pytest.mark.parametrize(
-    'args',
+    'args, expected_args',
     [
-        'six',
-        '-f foo.txt',
-        '-t -f foo.txt six, seven',
-        '-e "foo*" -f foo.txt six, seven',
-        'six.quarter six.half,, SIX',
+        ('six', 'six'),
+        ('-f foo.txt', '-f foo.txt'),
+        ('-t -f foo.txt six, seven', '-t -f foo.txt six, seven'),
+        ('-e "foo*" -f foo.txt six, seven', '-e "foo*" -f foo.txt six, seven'),
+        ('six.quarter six.half,, SIX', 'six.quarter six.half,, SIX'),
+        ('-f foo.txt six\nsix.half\nSIX', '-f foo.txt six six.half SIX'),
+        ('six \\ -e six.half', 'six -e six.half'),
     ]
 )
 @pytest.mark.parametrize('__python3',
                          [None,
                           f'/usr/bin/python{X_Y}',
                           '/usr/bin/python3.6'])
-def test_py3_check_import(args, __python3, lib):
+def test_py3_check_import(args, expected_args, __python3, lib):
     x_y = X_Y
     macros = {
         'buildroot': 'BUILDROOT',
@@ -650,7 +652,8 @@ def test_py3_check_import(args, __python3, lib):
         if (match := re.match(r'.+python(\d+\.\d+)$', __python3)):
             x_y = match.group(1)
 
-    lines = rpm_eval(f'%py3_check_import {args}', **macros)
+    invocation = '%{py3_check_import ' + args +'}'
+    lines = rpm_eval(invocation, **macros)
 
     # An equality check is a bit inflexible here,
     # every time we change the macro we need to change this test.
@@ -661,6 +664,7 @@ def test_py3_check_import(args, __python3, lib):
         PATH="BUILDROOT/usr/bin:$PATH"
         PYTHONPATH="${{PYTHONPATH:-BUILDROOT/usr/{lib}/python{x_y}/site-packages:BUILDROOT/usr/lib/python{x_y}/site-packages}}"
         PYTHONDONTWRITEBYTECODE=1
-        {__python3 or '/usr/bin/python3'} -s RPMCONFIGDIR/redhat/import_all_modules.py {args}
+        {__python3 or '/usr/bin/python3'} -s RPMCONFIGDIR/redhat/import_all_modules.py
+        {expected_args}
         """)
     assert lines == expected.splitlines()
diff --git a/tests/test_import_all_modules.py b/tests/test_import_all_modules.py
index 490ef1d..d60f6e4 100644
--- a/tests/test_import_all_modules.py
+++ b/tests/test_import_all_modules.py
@@ -30,6 +30,7 @@ def preserve_sys_modules():
         ('five  six seven', ['five', 'six', 'seven']),
         ('six,seven, eight', ['six', 'seven', 'eight']),
         ('six.quarter  six.half,, SIX', ['six.quarter', 'six.half', 'SIX']),
+        ('six.quarter  six.half,, SIX \\ ', ['six.quarter', 'six.half', 'SIX']),
     ]
 )
 def test_read_modules_from_cli(args, imports):