diff --git a/src/xdisp.c b/src/xdisp.c
index 4642541823c..527a79b38da 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -17422,9 +17422,9 @@ cursor_row_fully_visible_p (struct window *w, bool force_p,
 
 enum
 {
-  SCROLLING_SUCCESS,
-  SCROLLING_FAILED,
-  SCROLLING_NEED_LARGER_MATRICES
+  SCROLLING_SUCCESS = 1,
+  SCROLLING_FAILED = 0,
+  SCROLLING_NEED_LARGER_MATRICES = -1
 };
 
 /* If scroll-conservatively is more than this, never recenter.