diff --git a/source/gui/widgets/date_chooser.cpp b/source/gui/widgets/date_chooser.cpp
index 0085f30b..aa824637 100644
--- a/source/gui/widgets/date_chooser.cpp
+++ b/source/gui/widgets/date_chooser.cpp
@@ -393,7 +393,7 @@ namespace nana
 					int n = trace_.logic_pos.y * rows + trace_.logic_pos.x + 1;
 					if (page_mode::date == page)
 					{
-						if (n < 8) return false; //Here is week title bar
+						if (n < 8) return 0; //Here is week title bar
 						int dw = nana::date::day_of_week(view_month_.year, view_month_.month, 1);
 						n -= (dw ? dw + 7 : 14);
 					}
diff --git a/source/paint/graphics.cpp b/source/paint/graphics.cpp
index 6cbfe571..aa606f4e 100644
--- a/source/paint/graphics.cpp
+++ b/source/paint/graphics.cpp
@@ -140,13 +140,13 @@ namespace paint
 
 		unsigned font::height() const
 		{
-			if(empty()) return false;
+			if(empty()) return 0;
 			return (impl_->font_ptr->height);
 		}
 
 		unsigned font::weight() const
 		{
-			if(empty()) return false;
+			if(empty()) return 0;
 			return (impl_->font_ptr->weight);
 		}