diff --git a/Lib/fontTools/colorLib/builder.py b/Lib/fontTools/colorLib/builder.py
index c2315afbf..d2e35d810 100644
--- a/Lib/fontTools/colorLib/builder.py
+++ b/Lib/fontTools/colorLib/builder.py
@@ -252,7 +252,7 @@ def buildCOLR(
 
 def buildClipList(clipBoxes: Dict[str, _ClipBoxInput]) -> ot.ClipList:
     clipList = ot.ClipList()
-    clipList.Format = 0
+    clipList.Format = 1
     clipList.clips = {name: buildClipBox(box) for name, box in clipBoxes.items()}
     return clipList
 
@@ -265,7 +265,7 @@ def buildClipBox(clipBox: _ClipBoxInput) -> ot.ClipBox:
     if n not in (4, 5):
         raise ValueError(f"Invalid ClipBox: expected 4 or 5 values, found {n}")
     clip.xMin, clip.yMin, clip.xMax, clip.yMax = intRect(clipBox[:4])
-    clip.Format = int(n == 5)
+    clip.Format = int(n == 5) + 1
     if n == 5:
         clip.VarIndexBase = int(clipBox[4])
     return clip
diff --git a/Lib/fontTools/ttLib/tables/otData.py b/Lib/fontTools/ttLib/tables/otData.py
index 416a932a6..dd4033e43 100755
--- a/Lib/fontTools/ttLib/tables/otData.py
+++ b/Lib/fontTools/ttLib/tables/otData.py
@@ -1601,8 +1601,8 @@ otData = [
 		('LOffset', 'Paint', 'LayerCount', 0, 'Array of offsets to Paint tables, from the start of the LayerList table.'),
 	]),
 
-	('ClipListFormat0', [
-		('uint8', 'Format', None, None, 'Format for ClipList with 16bit glyph IDs: 0'),
+	('ClipListFormat1', [
+		('uint8', 'Format', None, None, 'Format for ClipList with 16bit glyph IDs: 1'),
 		('uint32', 'ClipCount', None, None, 'Number of Clip records.'),
 		('struct', 'ClipRecord', 'ClipCount', 0, 'Array of Clip records sorted by glyph ID.'),
 	]),
@@ -1613,16 +1613,16 @@ otData = [
 		('Offset24', 'ClipBox', None, None, 'Offset to a ClipBox table.'),
 	]),
 
-	('ClipBoxFormat0', [
-		('uint8', 'Format', None, None, 'Format for ClipBox without variation: set to 0.'),
+	('ClipBoxFormat1', [
+		('uint8', 'Format', None, None, 'Format for ClipBox without variation: set to 1.'),
 		('int16', 'xMin', None, None, 'Minimum x of clip box.'),
 		('int16', 'yMin', None, None, 'Minimum y of clip box.'),
 		('int16', 'xMax', None, None, 'Maximum x of clip box.'),
 		('int16', 'yMax', None, None, 'Maximum y of clip box.'),
 	]),
 
-	('ClipBoxFormat1', [
-		('uint8', 'Format', None, None, 'Format for variable ClipBox: set to 1.'),
+	('ClipBoxFormat2', [
+		('uint8', 'Format', None, None, 'Format for variable ClipBox: set to 2.'),
 		('int16', 'xMin', None, None, 'Minimum x of clip box.'),
 		('int16', 'yMin', None, None, 'Minimum y of clip box.'),
 		('int16', 'xMax', None, None, 'Maximum x of clip box.'),
diff --git a/Tests/colorLib/builder_test.py b/Tests/colorLib/builder_test.py
index 0a99a0288..f0a09924f 100644
--- a/Tests/colorLib/builder_test.py
+++ b/Tests/colorLib/builder_test.py
@@ -1681,7 +1681,7 @@ class BuildCOLRTest(object):
             },
         )
 
-        assert colr.table.ClipList.Format == 0
+        assert colr.table.ClipList.Format == 1
         clipBoxes = colr.table.ClipList.clips
         assert [
             (baseGlyph, clipBox.as_tuple()) for baseGlyph, clipBox in clipBoxes.items()
@@ -1689,8 +1689,8 @@ class BuildCOLRTest(object):
             ("a", (0, 0, 1000, 1000, 0)),
             ("c", (-101, -201, 1101, 1201)),
         ]
-        assert clipBoxes["a"].Format == 1
-        assert clipBoxes["c"].Format == 0
+        assert clipBoxes["a"].Format == 2
+        assert clipBoxes["c"].Format == 1
 
 
 class TrickyRadialGradientTest:
diff --git a/Tests/ttLib/tables/C_O_L_R_test.py b/Tests/ttLib/tables/C_O_L_R_test.py
index aeee80f3f..aaf330030 100644
--- a/Tests/ttLib/tables/C_O_L_R_test.py
+++ b/Tests/ttLib/tables/C_O_L_R_test.py
@@ -298,7 +298,7 @@ COLR_V1_SAMPLE = (
     (b" \x00", "Paint.Alpha (0.5)"),
 
     # ClipList
-    (b'\x00', "ClipList.Format (0)"),
+    (b'\x01', "ClipList.Format (1)"),
     (b'\x00\x00\x00\x02', "ClipList.ClipCount (2)"),
     (b'\x00\x0a', "ClipRecord[0].StartGlyphID (10)"),
     (b'\x00\x0a', "ClipRecord[0].EndGlyphID (10)"),
@@ -307,14 +307,14 @@ COLR_V1_SAMPLE = (
     (b'\x00\x0f', "ClipRecord[1].EndGlyphID (15)"),
     (b'\x00\x00\x20', "Offset to ClipBox subtable from beginning of ClipList (32)"),
 
-    (b'\x01', "ClipBox.Format (1)"),
+    (b'\x02', "ClipBox.Format (2)"),
     (b'\x00\x00', "ClipBox.xMin (0)"),
     (b'\x00\x00', "ClipBox.yMin (0)"),
     (b'\x01\xf4', "ClipBox.xMax (500)"),
     (b'\x01\xf4', "ClipBox.yMax (500)"),
     (b'\x00\x00\x00\t', "ClipBox.VarIndexBase (9)"),
 
-    (b'\x00', "ClipBox.Format (0)"),
+    (b'\x01', "ClipBox.Format (1)"),
     (b'\x00\x00', "ClipBox.xMin (0)"),
     (b'\x00\x00', "ClipBox.yMin (0)"),
     (b'\x03\xe8', "ClipBox.xMax (1000)"),
@@ -506,10 +506,10 @@ COLR_V1_XML = [
     '    <dy value="258"/>',
     "  </Paint>",
     "</LayerList>",
-    '<ClipList Format="0">',
+    '<ClipList Format="1">',
     "  <Clip>",
     '    <Glyph value="glyph00010"/>',
-    '    <ClipBox Format="1">',
+    '    <ClipBox Format="2">',
     '      <xMin value="0"/>',
     '      <yMin value="0"/>',
     '      <xMax value="500"/>',
@@ -520,7 +520,7 @@ COLR_V1_XML = [
     "  <Clip>",
     '    <Glyph value="glyph00014"/>',
     '    <Glyph value="glyph00015"/>',
-    '    <ClipBox Format="0">',
+    '    <ClipBox Format="1">',
     '      <xMin value="0"/>',
     '      <yMin value="0"/>',
     '      <xMax value="1000"/>',