diff --git a/src/reports.h b/src/reports.h
index 12cb198b0..ed0687985 100644
--- a/src/reports.h
+++ b/src/reports.h
@@ -25,6 +25,8 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <kernel/objtypes.h>
 #include <kernel/types.h>
 
+struct stream;
+
 #ifdef __cplusplus
 extern "C" {
 #endif