diff --git a/widget/src/windows/nsWindow.cpp b/widget/src/windows/nsWindow.cpp
index 29ae76f1a5a..c7344013cf7 100644
--- a/widget/src/windows/nsWindow.cpp
+++ b/widget/src/windows/nsWindow.cpp
@@ -761,6 +761,7 @@ nsWindow::nsWindow() : nsBaseWidget()
     mIMECompClauseString = NULL;
     mIMECompClauseStringSize = 0;
     mIMECompClauseStringLength = 0;
+    mIMECursorPosition = 0;
     mIMEReconvertUnicode = NULL;
     mLeadByte = '\0';
     mBlurEventSuppressionLevel = 0;