diff --git a/src/mills.cpp b/src/mills.cpp
index 6ed830df..cfbcb71f 100644
--- a/src/mills.cpp
+++ b/src/mills.cpp
@@ -470,7 +470,7 @@ Depth get_search_depth(const Position *pos)
         if (pos->phase == Phase::placing) {
             const Depth placingDepthTable[25] = {
                   +1,  1,  +1,  1,   /* 0 ~ 3 */
-                  +3, 15, +15, 15,   /* 4 ~ 7 */
+                  +3, 3, +15, 15,   /* 4 ~ 7 */
                   +15, 2, +8,  0,    /* 8 ~ 11 */
                   +0, 0, +0,  0,     /* 12 ~ 15 */
                   +0, 0, +0,  0,     /* 16 ~ 19 */