1 files changed, 1 insertions, 0 deletions
diff --git a/readline.c b/readline.c
index 6a3c260..e14c867 100644
--- a/readline.c
+++ b/readline.c
@@ -6,6 +6,7 @@
 #include "lualib.h"
 #include <readline/readline.h>
 #include <readline/history.h>
+#include <ctype.h>
 
 #if LUA_VERSION_NUM == 501
 # define lua_pushglobaltable(L) lua_pushvalue(L, LUA_GLOBALSINDEX)