diff --git a/processor/src/host/debug.rs b/processor/src/host/debug.rs
index 1636aa2452..5375ed67c0 100644
--- a/processor/src/host/debug.rs
+++ b/processor/src/host/debug.rs
@@ -1,6 +1,9 @@
 use super::{Felt, ProcessState};
 use crate::{Vec, Word};
-use vm_core::DebugOptions;
+use vm_core::{
+    utils::string::{String, ToString},
+    DebugOptions,
+};
 
 // DEBUG HANDLER
 // ================================================================================================
@@ -87,6 +90,7 @@ fn print_vm_stack(clk: u32, stack: Vec<Felt>, n: usize) {
 }
 
 /// Prints the whole memory state at the cycle `clk` in context `ctx`.
+#[cfg(feature = "std")]
 fn print_mem_all(clk: u32, ctx: u32, mem: Vec<(u64, Word)>) {
     println!("Memory state before step {clk} for the context {ctx}:");
 
@@ -121,6 +125,7 @@ fn print_mem_all(clk: u32, ctx: u32, mem: Vec<(u64, Word)>) {
 }
 
 /// Prints the memory value stored at the requested address `addr`.
+#[cfg(feature = "std")]
 fn print_mem(clk: u32, ctx: u32, addr: u32, value: Option<Word>, local: bool) {
     if local {
         println!("Local state before step {} for the context {} at index {}:", clk, ctx, addr);
@@ -139,6 +144,7 @@ fn print_mem(clk: u32, ctx: u32, addr: u32, value: Option<Word>, local: bool) {
 ///
 /// If `print_all` is true, the interval should contain all indexes of locals available for the
 /// current procedure.
+#[cfg(feature = "std")]
 fn print_local_interval<S: ProcessState>(
     process: &S,
     clk: u32,
@@ -171,6 +177,7 @@ fn print_local_interval<S: ProcessState>(
 ///
 /// `header` contains a title message corresponding to the DebugOption it is used in
 /// ([DebugOptions::MemInterval] or [DebugOptions::LocalInterval]).
+#[cfg(feature = "std")]
 fn print_mem_interval(mem: Vec<(u32, Option<Word>)>, header: String) {
     println!("{header}");