diff --git a/components/style/properties/longhand/border.mako.rs b/components/style/properties/longhand/border.mako.rs
index b62d1210480..fac233a6924 100644
--- a/components/style/properties/longhand/border.mako.rs
+++ b/components/style/properties/longhand/border.mako.rs
@@ -63,3 +63,9 @@
 % endfor
 
 ${helpers.single_keyword("box-decoration-break", "slice clone", products="gecko")}
+
+${helpers.single_keyword("-moz-float-edge",
+                         "content-box margin-box",
+                         gecko_ffi_name="mFloatEdge",
+                         gecko_constant_prefix="NS_STYLE_FLOAT_EDGE",
+                         products="gecko")}
diff --git a/ports/geckolib/gecko_bindings/structs.rs b/ports/geckolib/gecko_bindings/structs.rs
index 7958002e3c4..8ecb189fcdf 100644
--- a/ports/geckolib/gecko_bindings/structs.rs
+++ b/ports/geckolib/gecko_bindings/structs.rs
@@ -92,8 +92,8 @@ pub const NS_STYLE_BASIC_SHAPE_CIRCLE: ::std::os::raw::c_uint = 1;
 pub const NS_STYLE_BASIC_SHAPE_ELLIPSE: ::std::os::raw::c_uint = 2;
 pub const NS_STYLE_BASIC_SHAPE_INSET: ::std::os::raw::c_uint = 3;
 pub const NS_STYLE_BOX_SHADOW_INSET: ::std::os::raw::c_uint = 0;
-pub const NS_STYLE_FLOAT_EDGE_CONTENT: ::std::os::raw::c_uint = 0;
-pub const NS_STYLE_FLOAT_EDGE_MARGIN: ::std::os::raw::c_uint = 1;
+pub const NS_STYLE_FLOAT_EDGE_CONTENT_BOX: ::std::os::raw::c_uint = 0;
+pub const NS_STYLE_FLOAT_EDGE_MARGIN_BOX: ::std::os::raw::c_uint = 1;
 pub const NS_STYLE_USER_FOCUS_NONE: ::std::os::raw::c_uint = 0;
 pub const NS_STYLE_USER_FOCUS_IGNORE: ::std::os::raw::c_uint = 1;
 pub const NS_STYLE_USER_FOCUS_NORMAL: ::std::os::raw::c_uint = 2;