diff --git a/crates/idml/src/import.rs b/crates/idml/src/import.rs
index 3493d60a7..7490218cb 100644
--- a/crates/idml/src/import.rs
+++ b/crates/idml/src/import.rs
@@ -1190,7 +1190,7 @@ impl<'r> Importer<'r> {
             }
             cs.vj = e.get("VerticalJustification").map(names::vj_in);
             cs.first_baseline = e.get("FirstBaselineOffset").map(names::first_baseline_in);
-            cs.first_baseline_min = e.num("MinimumFirstBaselineOffset").map(|v| v.max(0.0));
+            cs.first_baseline_min = e.num("MinimumFirstBaselineOffset").filter(|v| v.is_finite()).map(|v| v.clamp(0.0, 8640.0));
             cs.strokes = ["TopEdge", "LeftEdge", "BottomEdge", "RightEdge"].map(|side| self.cell_stroke_attrs(e, side));
             if let Some(stroke) = uniform_cell_stroke(&cs.strokes) {
                 cs.stroke = Some(stroke);
@@ -2218,8 +2218,8 @@ impl<'r> Importer<'r> {
             if let Some(fb) = ce.get("FirstBaselineOffset") {
                 cell.first_baseline = names::first_baseline_in(fb);
             }
-            if let Some(min) = ce.num("MinimumFirstBaselineOffset") {
-                cell.first_baseline_min = min.max(0.0);
+            if let Some(min) = ce.num("MinimumFirstBaselineOffset").filter(|v| v.is_finite()) {
+                cell.first_baseline_min = min.clamp(0.0, 8640.0);
             }
             cell.rotation = ce.num("RotationAngle").unwrap_or(cell.rotation);
             for (i, side) in ["TopEdge", "LeftEdge", "BottomEdge", "RightEdge"].iter().enumerate() {