diff --git a/Tests/subset/data/expect_desubroutinize_CFF.ttx b/Tests/subset/data/expect_desubroutinize_CFF.ttx
index 494d0ce89..ab08088b1 100644
--- a/Tests/subset/data/expect_desubroutinize_CFF.ttx
+++ b/Tests/subset/data/expect_desubroutinize_CFF.ttx
@@ -13,6 +13,7 @@
       <Weight value="Regular"/>
       <isFixedPitch value="0"/>
       <ItalicAngle value="0"/>
+      <UnderlinePosition value="-100"/>
       <UnderlineThickness value="50"/>
       <PaintType value="0"/>
       <CharstringType value="2"/>
diff --git a/Tests/subset/data/expect_no_hinting_CFF.ttx b/Tests/subset/data/expect_no_hinting_CFF.ttx
index 7031c9741..c2d1872dc 100644
--- a/Tests/subset/data/expect_no_hinting_CFF.ttx
+++ b/Tests/subset/data/expect_no_hinting_CFF.ttx
@@ -13,6 +13,7 @@
       <Weight value="Regular"/>
       <isFixedPitch value="0"/>
       <ItalicAngle value="0"/>
+      <UnderlinePosition value="-100"/>
       <UnderlineThickness value="50"/>
       <PaintType value="0"/>
       <CharstringType value="2"/>
diff --git a/Tests/subset/data/expect_no_hinting_desubroutinize_CFF.ttx b/Tests/subset/data/expect_no_hinting_desubroutinize_CFF.ttx
index 7dae4e734..149f09594 100644
--- a/Tests/subset/data/expect_no_hinting_desubroutinize_CFF.ttx
+++ b/Tests/subset/data/expect_no_hinting_desubroutinize_CFF.ttx
@@ -13,6 +13,7 @@
       <Weight value="Regular"/>
       <isFixedPitch value="0"/>
       <ItalicAngle value="0"/>
+      <UnderlinePosition value="-100"/>
       <UnderlineThickness value="50"/>
       <PaintType value="0"/>
       <CharstringType value="2"/>
diff --git a/Tests/subset/data/expect_no_notdef_outline_otf.ttx b/Tests/subset/data/expect_no_notdef_outline_otf.ttx
index 02d40a7c2..498a44b4e 100644
--- a/Tests/subset/data/expect_no_notdef_outline_otf.ttx
+++ b/Tests/subset/data/expect_no_notdef_outline_otf.ttx
@@ -9,6 +9,7 @@
       <FamilyName value="Test OTF"/>
       <isFixedPitch value="0"/>
       <ItalicAngle value="0"/>
+      <UnderlinePosition value="-100"/>
       <UnderlineThickness value="50"/>
       <PaintType value="0"/>
       <CharstringType value="2"/>
diff --git a/Tests/ttLib/tables/data/C_F_F_.ttx b/Tests/ttLib/tables/data/C_F_F_.ttx
index 317a5bb80..dd095771e 100644
--- a/Tests/ttLib/tables/data/C_F_F_.ttx
+++ b/Tests/ttLib/tables/data/C_F_F_.ttx
@@ -23,6 +23,7 @@
       <FamilyName value="CFF2 Test Font1 Master"/>
       <isFixedPitch value="0"/>
       <ItalicAngle value="0"/>
+      <UnderlinePosition value="-100"/>
       <UnderlineThickness value="50"/>
       <PaintType value="0"/>
       <CharstringType value="2"/>