diff --git a/testdata/scad/bugs/issue990.scad b/testdata/scad/bugs/issue990.scad
new file mode 100644
index 00000000..172da17f
--- /dev/null
+++ b/testdata/scad/bugs/issue990.scad
@@ -0,0 +1,5 @@
+hull() {
+  for (i = [0:1]) {
+    cylinder(h=0);
+  }
+}
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ac5626fc..a4130dc9 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1205,7 +1205,8 @@ list(APPEND BUGS_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue584.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue913.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue936.scad
                        ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue964.scad
-                       ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue964b.scad)
+                       ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue964b.scad
+                       ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/issue990.scad)
 list(APPEND EXPORT3D_TEST_FILES ${BUGS_FILES})
 
 list(APPEND OPENCSGTEST_FILES ${BUGS_FILES})
diff --git a/tests/regression/cgalpngtest/issue990-expected.png b/tests/regression/cgalpngtest/issue990-expected.png
new file mode 100644
index 00000000..57f7f9d6
Binary files /dev/null and b/tests/regression/cgalpngtest/issue990-expected.png differ
diff --git a/tests/regression/opencsgtest/issue990-expected.png b/tests/regression/opencsgtest/issue990-expected.png
new file mode 100644
index 00000000..3bada54b
Binary files /dev/null and b/tests/regression/opencsgtest/issue990-expected.png differ