diff --git a/src/core/raster/qgsrasterlabeling.h b/src/core/raster/qgsrasterlabeling.h
index 880c42c775d..24d1ae02e79 100644
--- a/src/core/raster/qgsrasterlabeling.h
+++ b/src/core/raster/qgsrasterlabeling.h
@@ -29,7 +29,7 @@
 class QgsRasterLayer;
 class QgsNumericFormat;
 class QgsRasterPipe;
-class QgsRasterViewPort;
+struct QgsRasterViewPort;
 class QgsRasterLayerRendererFeedback;
 
 #ifndef SIP_RUN