diff --git a/src/cc/sudoku.cpp b/src/cc/sudoku.cpp
index 0fa750d6d..05450659a 100644
--- a/src/cc/sudoku.cpp
+++ b/src/cc/sudoku.cpp
@@ -526,7 +526,7 @@ int32_t sudoku_captcha(uint32_t timestamps[81])
             n++;
         }
     }
-    //if ( n > 81/2 )
+    if ( n > 81/2 )
     {
         std::sort(list.begin(),list.end());
         solvetime = (list[n-1] - list[0]);
@@ -557,7 +557,7 @@ int32_t sudoku_captcha(uint32_t timestamps[81])
                 return(-1 * 0);
             else return(0);
         }
-    } //else return(-1);
+    } else return(-1);
 }
 
 CScript sudoku_genopret(uint8_t unsolved[9][9])