diff --git a/frameworks/inputmethod_controller/src/input_method_controller.cpp b/frameworks/inputmethod_controller/src/input_method_controller.cpp
index ed07a7d..81cce85 100644
--- a/frameworks/inputmethod_controller/src/input_method_controller.cpp
+++ b/frameworks/inputmethod_controller/src/input_method_controller.cpp
@@ -386,7 +386,7 @@ using namespace MessageID;
     {
         IMSA_HILOGI("InputMethodController::GetTextBeforeCursor");
         if (!mTextString.empty()) {
-            int32_t endPos = (mSelectNewEnd+number<mTextString.size()) ? (mSelectNewEnd + number) : mTextString.size();
+            int32_t endPos = (mSelectNewEnd+number < static_cast<int32_t>(mTextString.size())) ? (mSelectNewEnd + number) : mTextString.size();
             return mTextString.substr(mSelectNewEnd, endPos);
         }
         return u"";