diff --git a/clientgui/ViewProjectsGrid.h b/clientgui/ViewProjectsGrid.h
index 1afd59f4ce..c62b602e49 100644
--- a/clientgui/ViewProjectsGrid.h
+++ b/clientgui/ViewProjectsGrid.h
@@ -25,8 +25,8 @@
 #endif
 
 
-// Set to 1 to prevent mutliple selections
-#define PREVENT_MULTIPLE_PROJECT_SELECTIONS 0
+// Set to TRUE to prevent mutliple selections
+#define PREVENT_MULTIPLE_PROJECT_SELECTIONS FALSE
 
 class CBOINCGridCtrl;
 
diff --git a/clientgui/ViewWorkGrid.h b/clientgui/ViewWorkGrid.h
index a7b251ad5a..c3883cc343 100644
--- a/clientgui/ViewWorkGrid.h
+++ b/clientgui/ViewWorkGrid.h
@@ -24,8 +24,8 @@
 #pragma interface "ViewWorkGrid.cpp"
 #endif
 
-// Set to 1 to prevent mutliple selections
-#define PREVENT_MULTIPLE_TASK_SELECTIONS 0
+// Set to TRUE to prevent mutliple selections
+#define PREVENT_MULTIPLE_TASK_SELECTIONS FALSE
 
 #include "BOINCBaseView.h"
 #include "BOINCGridCtrl.h"