diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index 9ece280715..8a632fcd91 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -7,7 +7,8 @@ struct buffer_data {
     char *ptr;
 };
 
-void string_debug(void *data, int level, const char *file, int line, const char *str)
+#if defined(MBEDTLS_SSL_TLS_C)
+static void string_debug(void *data, int level, const char *file, int line, const char *str)
 {
     struct buffer_data *buffer = (struct buffer_data *) data;
     char *p = buffer->ptr;
@@ -42,14 +43,15 @@ void string_debug(void *data, int level, const char *file, int line, const char
 
     buffer->ptr = p;
 }
+#endif /* MBEDTLS_SSL_TLS_C */
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
- * depends_on:MBEDTLS_DEBUG_C:MBEDTLS_SSL_TLS_C
+ * depends_on:MBEDTLS_DEBUG_C
  * END_DEPENDENCIES
  */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_TLS_C */
 void debug_print_msg_threshold(int threshold, int level, char *file,
                                int line, char *result_str)
 {
@@ -80,7 +82,7 @@ exit:
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_TLS_C */
 void mbedtls_debug_print_ret(char *file, int line, char *text, int value,
                              char *result_str)
 {
@@ -109,7 +111,7 @@ exit:
 }
 /* END_CASE */
 
-/* BEGIN_CASE */
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_TLS_C */
 void mbedtls_debug_print_buf(char *file, int line, char *text,
                              data_t *data, char *result_str)
 {
@@ -138,7 +140,7 @@ exit:
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_TLS_C:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
 void mbedtls_debug_print_crt(char *crt_file, char *file, int line,
                              char *prefix, char *result_str)
 {
@@ -172,7 +174,7 @@ exit:
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_BIGNUM_C */
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_TLS_C:MBEDTLS_BIGNUM_C */
 void mbedtls_debug_print_mpi(char *value, char *file, int line,
                              char *prefix, char *result_str)
 {