diff --git a/luamml-convert.lua b/luamml-convert.lua
index fe529de..abb6615 100644
--- a/luamml-convert.lua
+++ b/luamml-convert.lua
@@ -370,7 +370,8 @@ local function radical_to_table(radical, sub, cur_style, text_families)
elem, core = {[0] = 'msqrt', nucleus, }, nil
elseif kind == 'uroot' then
-- FIXME: Check that this is really a root
- elem, core = {[0] = 'msqrt', nucleus, kernel_to_table(radical.degree, 7, text_families)}, nil
+ -- UF 2024-12-04: force use of only one return value
+ elem, core = {[0] = 'mroot', nucleus, (kernel_to_table(radical.degree, 7, text_families))}, nil
elseif kind == 'uunderdelimiter' then
elem, core = {[0] = 'munder', left, nucleus}, left
elseif kind == 'uoverdelimiter' then
diff --git a/testfiles-lua/test_sqrt-xml.mlr b/testfiles-lua/test_sqrt-xml.mlr
new file mode 100644
index 0000000..361f864
--- /dev/null
+++ b/testfiles-lua/test_sqrt-xml.mlr
@@ -0,0 +1,33 @@
+
+
+
+
diff --git a/testfiles-lua/test_sqrt-xml.mlt b/testfiles-lua/test_sqrt-xml.mlt
new file mode 100644
index 0000000..36a3751
--- /dev/null
+++ b/testfiles-lua/test_sqrt-xml.mlt
@@ -0,0 +1,28 @@
+\DocumentMetadata{
+ uncompress,
+ pdfversion = 2.0,
+ testphase = {phase-III,table,math},
+}
+\input{regression-test}
+\documentclass{article}
+\usepackage{unicode-math}
+
+\begin{document}
+\ExplSyntaxOn
+\luamml_set_filename:n {
+ \jobname .mml
+ }
+\luamml_process:
+\luamml_begin_single_file:
+\ExplSyntaxOff
+
+$ \sqrt{x} $
+
+$ \sqrt{\sqrt{x}} + 2 $
+
+$ x = \sqrt{\sqrt[3]{y^2}} $
+
+$\sqrt[3]{y}$
+\end{document}
+
+
diff --git a/testfiles-lua/test_sqrt.pvt b/testfiles-lua/test_sqrt.pvt
new file mode 100644
index 0000000..c299491
--- /dev/null
+++ b/testfiles-lua/test_sqrt.pvt
@@ -0,0 +1,22 @@
+\ExplSyntaxOn
+\sys_gset_rand_seed:n{42}
+\ExplSyntaxOff
+\DocumentMetadata{
+ uncompress,
+ pdfversion = 2.0,
+ testphase = {phase-III,math,table},
+}
+\input{regression-test}
+\documentclass{article}
+\usepackage{unicode-math}
+\tagpdfsetup{math/mathml/structelem}
+\begin{document}
+
+$ \sqrt{x} $
+
+$ \sqrt{\sqrt{x}} + 2 $
+
+$ x = \sqrt{\sqrt[3]{y^2}} $
+
+$\sqrt[3]{y}$
+\end{document}
diff --git a/testfiles-lua/test_sqrt.tpf b/testfiles-lua/test_sqrt.tpf
new file mode 100644
index 0000000..5b360d5
--- /dev/null
+++ b/testfiles-lua/test_sqrt.tpf
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