diff --git a/src/rstd/inlining/static_pair.rs b/src/rstd/inlining/static_pair.rs
index 6079e8a..2c6815a 100644
--- a/src/rstd/inlining/static_pair.rs
+++ b/src/rstd/inlining/static_pair.rs
@@ -176,7 +176,7 @@ where
     pub fn mdeserialize_sp<I: InCtx<'a, Ctx>>(
         factory_data: &SP::FactoryData,
         inctx: I,
-    ) -> ModeResultM<'a, Ctx, Self, I> {
+    ) -> ModeResultP<Self, SP, <Self as FactoryBase<'a, Ctx>>::ParseError, I> {
         let (fa, fb) = SP::factories(factory_data);
         let (a, inctx) = fa
             .ideserialize(inctx)
@@ -184,7 +184,7 @@ where
         Self::bind(
             fb.mdeserialize(inctx)
                 .map_err(|e| SP::from_error_b(factory_data, e))?,
-            |b| SP::from_parsed(factory_data, a, b).map(|pair| StaticPairObject { pair }),
+            |b| SP::from_parsed(factory_data, a, b),
         )
     }
 }
@@ -195,7 +195,10 @@ where
     SP::FB: FactoryModeParse<'a, Ctx>,
 {
     fn mdeserialize<I: InCtx<'a, Ctx>>(&self, inctx: I) -> ModeResultM<'a, Ctx, Self, I> {
-        Self::mdeserialize_sp(&self.factory_data, inctx)
+        Ok(Self::map(
+            Self::mdeserialize_sp(&self.factory_data, inctx)?,
+            |pair| StaticPairObject { pair },
+        ))
     }
 
     fn mextend(