diff --git a/CMakeLists.txt b/CMakeLists.txt
index f07fe7d22..04b882d0f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,7 @@ endfunction()
 project(abc)
 
 if(READLINE_FOUND MATCHES TRUE)
-    addprefix(ABC_READLINE_INCLUDES_FLAGS "-I" ${READLINE_INCLUDES})
+    addprefix(ABC_READLINE_INCLUDES_FLAGS "-I" ${READLINE_INCLUDE})
     string(REPLACE ";" " " ABC_READLINE_INCLUDES_FLAGS "${ABC_READLINE_INCLUDES_FLAGS}")
     list(APPEND ABC_READLINE_FLAGS "ABC_READLINE_INCLUDES=${ABC_READLINE_INCLUDES_FLAGS}")