diff --git a/ports/geckolib/gecko_bindings/bindings.rs b/ports/geckolib/gecko_bindings/bindings.rs
index b65b0bc4e16..713d3a8a523 100644
--- a/ports/geckolib/gecko_bindings/bindings.rs
+++ b/ports/geckolib/gecko_bindings/bindings.rs
@@ -123,6 +123,15 @@ unsafe impl Sync for nsStyleImageLayers {}
 impl HeapSizeOf for nsStyleImageLayers { fn heap_size_of_children(&self) -> usize { 0 } }
 use structs::nsStyleImageLayers_Layer as Layer;
 use structs::nsStyleImageLayers_LayerType as LayerType;
+use structs::nsStyleUnit;
+unsafe impl Send for nsStyleUnit {}
+unsafe impl Sync for nsStyleUnit {}
+impl HeapSizeOf for nsStyleUnit { fn heap_size_of_children(&self) -> usize { 0 } }
+use structs::nsStyleUnion;
+unsafe impl Send for nsStyleUnion {}
+unsafe impl Sync for nsStyleUnion {}
+impl HeapSizeOf for nsStyleUnion { fn heap_size_of_children(&self) -> usize { 0 } }
+use structs::nsStyleCoord_CalcValue as CalcValue;
 use structs::SheetParsingMode;
 use structs::nsMainThreadPtrHandle;
 use structs::nsMainThreadPtrHolder;
@@ -255,6 +264,11 @@ extern "C" {
                                          len: usize);
     pub fn Gecko_InitializeImageLayer(layer: *mut Layer,
                                       layer_type: LayerType);
+    pub fn Gecko_ResetStyleCoord(unit: *mut nsStyleUnit,
+                                 value: *mut nsStyleUnion);
+    pub fn Gecko_SetStyleCoordCalcValue(unit: *mut nsStyleUnit,
+                                        value: *mut nsStyleUnion,
+                                        calc: CalcValue);
     pub fn Servo_StylesheetFromUTF8Bytes(bytes: *const u8, length: u32,
                                          parsing_mode: SheetParsingMode,
                                          base: *mut ThreadSafeURIHolder,
diff --git a/ports/geckolib/gecko_bindings/tools/regen.py b/ports/geckolib/gecko_bindings/tools/regen.py
index 82897ffdb8d..fbc52b42396 100755
--- a/ports/geckolib/gecko_bindings/tools/regen.py
+++ b/ports/geckolib/gecko_bindings/tools/regen.py
@@ -120,6 +120,7 @@ COMPILATION_TARGETS = {
             "nsStyleEffects", "nsStyleImage", "nsStyleGradient",
             "nsStyleCoord", "nsStyleGradientStop", "nsStyleImageLayers",
             "nsStyleImageLayers::Layer", "nsStyleImageLayers::LayerType",
+            "nsStyleUnit", "nsStyleUnion", "nsStyleCoord::CalcValue",
 
             "SheetParsingMode", "nsMainThreadPtrHandle",
             "nsMainThreadPtrHolder", "nscolor", "nsFont", "FontFamilyList",