diff --git a/tests/32bit_unit_tests/mocks/mock_print.cpp b/tests/32bit_unit_tests/mocks/mock_print.cpp
index ffd06089f2..f93ae20f44 100644
--- a/tests/32bit_unit_tests/mocks/mock_print.cpp
+++ b/tests/32bit_unit_tests/mocks/mock_print.cpp
@@ -1,4 +1,5 @@
 #include "io/debug/print.h"
+#include <cstdio>
 #include <iostream>
 using namespace std;
 
@@ -23,3 +24,7 @@ void print(int32_t number) {
 }
 
 } // namespace Debug
+
+void putchar_(char c) {
+	putchar(c);
+}