diff --git a/include/config.h b/include/config.h
index 3cbaa310..1ae12e46 100644
--- a/include/config.h
+++ b/include/config.h
@@ -43,6 +43,8 @@
 
 #define DEFAULT_RULE_NUMBER 1
 
+#define DEPTH_ADJUST (0)
+
 //#define HARD_LEVEL_DEPTH
 
 //#define TIME_STAT
diff --git a/src/ai/search.cpp b/src/ai/search.cpp
index 7dd49f96..7743e7ec 100644
--- a/src/ai/search.cpp
+++ b/src/ai/search.cpp
@@ -156,6 +156,10 @@ depth_t AIAlgorithm::changeDepth(depth_t origDepth)
         d -= reduce;
     }
 
+    d += DEPTH_ADJUST;
+
+    d = d >= 1 ? d : 1;
+
     loggerDebug("Depth: %d\n", d);
 
     return d;
diff --git a/src/game/types.h b/src/game/types.h
index 9d56591e..90cfb530 100644
--- a/src/game/types.h
+++ b/src/game/types.h
@@ -23,7 +23,7 @@
 #include "config.h"
 
 using step_t = uint16_t;
-using depth_t = uint8_t;
+using depth_t = int8_t;
 using location_t = uint8_t;
 
 #ifdef TRANSPOSITION_TABLE_CUTDOWN