diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1adcc8949..bda608b11 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -395,6 +395,7 @@ add_custom_target(rust-bindgen
     --allowlist-function secp256k1_ecdsa_anti_exfil_host_commit
     --allowlist-function wally_get_secp_context
     --allowlist-function wally_hash160
+    --allowlist-function printf
     ${CMAKE_CURRENT_SOURCE_DIR}/rust/bitbox02-sys/wrapper.h --
     -DPB_NO_PACKED_STRUCTS=1 -DPB_FIELD_16BIT=1 -fshort-enums ${RUST_BINDGEN_FLAGS} ${RUST_INCLUDES}
   COMMAND
diff --git a/src/rust/bitbox02/src/lib.rs b/src/rust/bitbox02/src/lib.rs
index c05903549..bbd7dfd07 100644
--- a/src/rust/bitbox02/src/lib.rs
+++ b/src/rust/bitbox02/src/lib.rs
@@ -176,6 +176,13 @@ pub fn reboot() -> ! {
     panic!("reboot called")
 }
 
+#[cfg(feature = "testing")]
+pub fn print_stdout(msg: &str) {
+    unsafe {
+        bitbox02_sys::printf(crate::util::str_to_cstr_vec(msg).unwrap().as_ptr());
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;