1 files changed, 1 insertions, 0 deletions

diff --git a/src/gmdocument.c b/src/gmdocument.c
index 20874d8a..582af833 100644
--- a/src/gmdocument.c
+++ b/src/gmdocument.c
@@ -13,6 +13,7 @@
 #include <SDL_hints.h>
 #include <SDL_render.h>
 #include <stb_image.h>
+#include <ctype.h>
 
 iDeclareType(GmLink)