diff --git a/core-backend/src/funcs.rs b/core-backend/src/funcs.rs
index 8fc5c796cf2..0862d2d06a3 100644
--- a/core-backend/src/funcs.rs
+++ b/core-backend/src/funcs.rs
@@ -163,11 +163,11 @@ impl From<u32> for SysCallReturnValue {
     }
 }
 
-pub trait SysCallContext: Sized {
+pub(crate) trait SysCallContext: Sized {
     fn from_args(args: &[Value]) -> Result<(Self, &[Value]), HostError>;
 }
 
-pub trait SysCall<Ext, T = ()> {
+pub(crate) trait SysCall<Ext, T = ()> {
     type Context: SysCallContext;
 
     fn execute(
@@ -177,7 +177,7 @@ pub trait SysCall<Ext, T = ()> {
     ) -> Result<(u64, T), HostError>;
 }
 
-pub trait SysCallBuilder<Ext, Args: ?Sized, R, S> {
+pub(crate) trait SysCallBuilder<Ext, Args: ?Sized, R, S> {
     fn build(self, args: &[Value]) -> Result<S, HostError>;
 }
 
@@ -1245,7 +1245,14 @@ where
 
         ctx.ext_mut()
             .create_program(
-                InitPacket::maybe_with_gas(code_id.into(), salt, payload, Some(message_id), gas_limit, value),
+                InitPacket::maybe_with_gas(
+                    code_id.into(),
+                    salt,
+                    payload,
+                    Some(message_id),
+                    gas_limit,
+                    value,
+                ),
                 delay,
             )
             .map_err(Into::into)