diff --git a/lldb/source/Host/common/Editline.cpp b/lldb/source/Host/common/Editline.cpp
index f32b2de9c728effe40e4202880e27138c197741b..d0170620f59e76ce8170f4ef0fe45ae7dde163a2 100644
--- a/lldb/source/Host/common/Editline.cpp
+++ b/lldb/source/Host/common/Editline.cpp
@@ -67,7 +67,7 @@ Editline::Editline (const char *prog,       // prog can't be NULL
 
     assert (m_editline);
     ::el_set (m_editline, EL_CLIENTDATA, this);
-#idef EL_PROMPT_ESC
+#ifdef EL_PROMPT_ESC
     ::el_set (m_editline, EL_PROMPT_ESC, GetPromptCallback, k_prompt_escape_char);
 #endif
     ::el_set (m_editline, EL_EDITOR, "emacs");