1 files changed, 1 insertions, 0 deletions
diff --git a/Project/Workspace.h b/Project/Workspace.h
index afcb1b3..a48ad4e 100644
--- a/Project/Workspace.h
+++ b/Project/Workspace.h
@@ -55,6 +55,7 @@ class PowerQuality;
 
 class ElementPlotData;
 class ChartView;
+class FrequencyResponseForm;
 
 class PropertiesData;