diff --git a/servo/components/style/build.rs b/servo/components/style/build.rs
index 4dd0125ed0ca6..3ab9491b34a65 100644
--- a/servo/components/style/build.rs
+++ b/servo/components/style/build.rs
@@ -702,6 +702,101 @@ crate
 "
 )
 .
+envs
+(
+if
+std
+:
+:
+mem
+:
+:
+size_of
+:
+:
+<
+Option
+<
+bool
+>
+>
+(
+)
+=
+=
+1
+{
+/
+/
+FIXME
+:
+remove
+this
+envs
+(
+)
+call
+/
+/
+and
+make
+unconditional
+code
+that
+depends
+on
+RUSTC_HAS_PR45225
+/
+/
+once
+Firefox
+requires
+Rust
+1
+.
+23
++
+/
+/
+https
+:
+/
+/
+github
+.
+com
+/
+rust
+-
+lang
+/
+rust
+/
+pull
+/
+45225
+vec
+!
+[
+(
+"
+RUSTC_HAS_PR45225
+"
+"
+1
+"
+)
+]
+}
+else
+{
+vec
+!
+[
+]
+}
+)
+.
 status
 (
 )
diff --git a/servo/components/style/properties/build.py b/servo/components/style/properties/build.py
index c32abb4d3da87..11b07cca4ca42 100644
--- a/servo/components/style/properties/build.py
+++ b/servo/components/style/properties/build.py
@@ -319,6 +319,19 @@
 __file__
 =
 template
+                  
+RUSTC_HAS_PR45225
+=
+os
+.
+environ
+.
+get
+(
+"
+RUSTC_HAS_PR45225
+"
+)
 )
     
 if
diff --git a/servo/components/style/properties/data.py b/servo/components/style/properties/data.py
index a38061a62b123..530bc9819f0db 100644
--- a/servo/components/style/properties/data.py
+++ b/servo/components/style/properties/data.py
@@ -1194,6 +1194,19 @@
 False
 "
 ]
+"
+Unexpected
+value
+for
+boolean
+arguement
+:
+"
++
+repr
+(
+arg
+)
     
 return
 arg
diff --git a/servo/components/style/properties/longhand/inherited_svg.mako.rs b/servo/components/style/properties/longhand/inherited_svg.mako.rs
index ced3e93286b41..b8998d22478e8 100644
--- a/servo/components/style/properties/longhand/inherited_svg.mako.rs
+++ b/servo/components/style/properties/longhand/inherited_svg.mako.rs
@@ -622,9 +622,8 @@ gecko
 "
 boxed
 =
-"
-True
-"
+not
+RUSTC_HAS_PR45225
 animation_value_type
 =
 "
@@ -980,9 +979,8 @@ gecko
 "
 boxed
 =
-"
-True
-"
+not
+RUSTC_HAS_PR45225
 animation_value_type
 =
 "
diff --git a/servo/components/style/properties/longhand/pointing.mako.rs b/servo/components/style/properties/longhand/pointing.mako.rs
index 6786330acfeac..ed11c67a10167 100644
--- a/servo/components/style/properties/longhand/pointing.mako.rs
+++ b/servo/components/style/properties/longhand/pointing.mako.rs
@@ -1574,7 +1574,8 @@ Auto
 "
 boxed
 =
-True
+not
+RUSTC_HAS_PR45225
 ignored_when_colors_disabled
 =
 True
diff --git a/servo/tests/unit/stylo/build.rs b/servo/tests/unit/stylo/build.rs
index 2a549bdbe6ee5..d5e7c897c5b44 100644
--- a/servo/tests/unit/stylo/build.rs
+++ b/servo/tests/unit/stylo/build.rs
@@ -108,6 +108,61 @@ main
 (
 )
 {
+if
+std
+:
+:
+mem
+:
+:
+size_of
+:
+:
+<
+Option
+<
+bool
+>
+>
+(
+)
+=
+=
+1
+{
+/
+/
+https
+:
+/
+/
+github
+.
+com
+/
+rust
+-
+lang
+/
+rust
+/
+pull
+/
+45225
+println
+!
+(
+"
+cargo
+:
+rustc
+-
+cfg
+=
+rustc_has_pr45225
+"
+)
+}
 let
 root_path
 =
diff --git a/servo/tests/unit/stylo/size_of.rs b/servo/tests/unit/stylo/size_of.rs
index d15b4ef494ff9..05e14f4bf5cae 100644
--- a/servo/tests/unit/stylo/size_of.rs
+++ b/servo/tests/unit/stylo/size_of.rs
@@ -632,7 +632,19 @@ image
 :
 :
 ImageLayer
+if
+cfg
+!
+(
+rustc_has_pr45225
+)
+{
+40
+}
+else
+{
 48
+}
 )
 ;
 size_of_test
@@ -646,6 +658,18 @@ image
 :
 :
 ImageLayer
+if
+cfg
+!
+(
+rustc_has_pr45225
+)
+{
+40
+}
+else
+{
 48
+}
 )
 ;