diff --git a/components/style/gecko_bindings/sugar/ns_compatibility.rs b/components/style/gecko_bindings/sugar/ns_compatibility.rs
index 3fe63391d36..eaf97ca6f31 100644
--- a/components/style/gecko_bindings/sugar/ns_compatibility.rs
+++ b/components/style/gecko_bindings/sugar/ns_compatibility.rs
@@ -8,6 +8,7 @@ use context::QuirksMode;
 use gecko_bindings::structs::nsCompatibility;
 
 impl From<nsCompatibility> for QuirksMode {
+    #[inline]
     fn from(mode: nsCompatibility) -> QuirksMode {
         match mode {
             nsCompatibility::eCompatibility_FullStandards => QuirksMode::NoQuirks,
diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index 5133cd6ae2d..4e52412c18d 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -593,18 +593,21 @@ impl NonCustomPropertyId {
 }
 
 impl From<LonghandId> for NonCustomPropertyId {
+    #[inline]
     fn from(id: LonghandId) -> Self {
         NonCustomPropertyId(id as usize)
     }
 }
 
 impl From<ShorthandId> for NonCustomPropertyId {
+    #[inline]
     fn from(id: ShorthandId) -> Self {
         NonCustomPropertyId((id as usize) + ${len(data.longhands)})
     }
 }
 
 impl From<AliasId> for NonCustomPropertyId {
+    #[inline]
     fn from(id: AliasId) -> Self {
         NonCustomPropertyId(id as usize + ${len(data.longhands) + len(data.shorthands)})
     }