diff --git a/c3.js b/c3.js
index 0962045..5445300 100644
--- a/c3.js
+++ b/c3.js
@@ -2063,7 +2063,7 @@
                 if (tooltipRight > chartRight) {
                     tooltipLeft -= tooltipRight - chartRight;
                 }
-                if (tooltipTop + tHeight > getCurrentHeight()) {
+                if (tooltipTop + tHeight > getCurrentHeight() && tooltipTop > tHeight + 30) {
                     tooltipTop -= tHeight + 30;
                 }
             }