diff --git a/src/server/services/wms/qgswmsgetlegendgraphics.cpp b/src/server/services/wms/qgswmsgetlegendgraphics.cpp
index 39d748ab995..355622139ac 100644
--- a/src/server/services/wms/qgswmsgetlegendgraphics.cpp
+++ b/src/server/services/wms/qgswmsgetlegendgraphics.cpp
@@ -96,8 +96,7 @@ namespace QgsWms
     }
     else
     {
-      throw QgsServiceException( QStringLiteral( "UnknownError" ),
-                                 QStringLiteral( "Failed to compute GetLegendGraphics image" ) );
+      throw QgsException( QStringLiteral( "Failed to compute GetLegendGraphics image" ) );
     }
   }
 } // namespace QgsWms
diff --git a/src/server/services/wms/qgswmsgetmap.cpp b/src/server/services/wms/qgswmsgetmap.cpp
index 711875bfb9c..d1d7d650811 100644
--- a/src/server/services/wms/qgswmsgetmap.cpp
+++ b/src/server/services/wms/qgswmsgetmap.cpp
@@ -57,8 +57,7 @@ namespace QgsWms
     }
     else
     {
-      throw QgsServiceException( QStringLiteral( "UnknownError" ),
-                                 QStringLiteral( "Failed to compute GetMap image" ) );
+      throw QgsException( QStringLiteral( "Failed to compute GetMap image" ) );
     }
   }
 } // namespace QgsWms