diff --git a/include/mbedtls/gcm.h b/include/mbedtls/gcm.h
index bec5577..4b0c361 100644
--- a/include/mbedtls/gcm.h
+++ b/include/mbedtls/gcm.h
@@ -250,6 +250,8 @@
  */
 void mbedtls_gcm_free( mbedtls_gcm_context *ctx );
 
+#if defined(MBEDTLS_SELF_TEST)
+
 /**
  * \brief          The GCM checkup routine.
  *
@@ -258,6 +260,8 @@
  */
 int mbedtls_gcm_self_test( int verbose );
 
+#endif /* MBEDTLS_SELF_TEST */
+
 #ifdef __cplusplus
 }
 #endif