diff --git a/cmake/define.inc b/cmake/define.inc
index d4f3b3c8bfc4f163336d6739be8b27d97f53dc29..c72995159f8ed3ba38f1b8c1b84810ddf59b77c9 100755
--- a/cmake/define.inc
+++ b/cmake/define.inc
@@ -33,11 +33,7 @@ IF (TD_LINUX_64)
   ADD_DEFINITIONS(-D_M_X64)
   ADD_DEFINITIONS(-D_TD_LINUX_64)
   SET(COMMON_FLAGS "-std=gnu99 -Wall -Werror -fPIC -g3 -gdwarf-2 -msse4.2 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILE")
-  
-  FIND_PATH(ICONV_INCLUDE_EXIST iconv.h /usr/include/ /usr/local/include/)
-  IF (ICONV_INCLUDE_EXIST)
-    ADD_DEFINITIONS(-DUSE_LIBICONV)
-  ENDIF ()
+  ADD_DEFINITIONS(-DUSE_LIBICONV)
 ENDIF ()
 
 IF (TD_LINUX_32)
@@ -134,6 +130,7 @@ ENDIF ()
 
 IF (TD_WINDOWS_32)
   ADD_DEFINITIONS(-D_TD_WINDOWS_32)
+  ADD_DEFINITIONS(-DUSE_LIBICONV)
 ENDIF ()
 
 INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/src/inc)