diff --git a/tester/common/bc_tester_utils.c b/tester/common/bc_tester_utils.c
index 057217584..22d74cd02 100644
--- a/tester/common/bc_tester_utils.c
+++ b/tester/common/bc_tester_utils.c
@@ -41,6 +41,9 @@ const char *bc_tester_writable_dir_prefix = "/data/data/org.linphone.tester/cach
 const char *bc_tester_writable_dir_prefix = ".";
 #endif
 
+int bc_printf_verbosity_info;
+int bc_printf_verbosity_error;
+
 static test_suite_t **test_suite = NULL;
 static int nb_test_suites = 0;
 
diff --git a/tester/common/bc_tester_utils.h b/tester/common/bc_tester_utils.h
index 374e9fad0..815e74eb6 100644
--- a/tester/common/bc_tester_utils.h
+++ b/tester/common/bc_tester_utils.h
@@ -26,8 +26,8 @@
 extern const char *bc_tester_read_dir_prefix;
 extern const char *bc_tester_writable_dir_prefix;
 
-int bc_printf_verbosity_info;
-int bc_printf_verbosity_error;
+extern int bc_printf_verbosity_info;
+extern int bc_printf_verbosity_error;
 
 typedef void (*test_function_t)(void);
 typedef int (*test_suite_function_t)(const char *name);