diff --git a/src/TouchDrvCSTXXX.hpp b/src/TouchDrvCSTXXX.hpp
index df7c6f3..3c46e4d 100644
--- a/src/TouchDrvCSTXXX.hpp
+++ b/src/TouchDrvCSTXXX.hpp
@@ -201,7 +201,7 @@ class TouchDrvCSTXXX : public TouchDrvInterface
         }
         if (!drv) {
             __touch_type = TouchDrv_UNKOWN;
-            return true;
+            return false;
         }
         return drv != NULL;
     }
@@ -246,7 +246,7 @@ class TouchDrvCSTXXX : public TouchDrvInterface
         }
         if (!drv) {
             __touch_type = TouchDrv_UNKOWN;
-            return true;
+            return false;
         }
         return drv != NULL;
     }
@@ -291,7 +291,7 @@ class TouchDrvCSTXXX : public TouchDrvInterface
         }
         if (!drv) {
             __touch_type = TouchDrv_UNKOWN;
-            return true;
+            return false;
         }
         return drv != NULL;
     }
@@ -347,7 +347,7 @@ class TouchDrvCSTXXX : public TouchDrvInterface
         }
         if (!drv) {
             __touch_type = TouchDrv_UNKOWN;
-            return true;
+            return false;
         }
         return drv != NULL;
     }