diff --git a/src/study.h b/src/study.h
index 20903583a..9d053dd5e 100644
--- a/src/study.h
+++ b/src/study.h
@@ -45,7 +45,7 @@ extern "C" {
 
     void demon_skillchange(struct unit *u);
 
-#define MAXTEACHERS 32
+#define MAXTEACHERS 64
 #define TEACHNUMBER 10
     typedef struct teaching_info {
         struct unit *teachers[MAXTEACHERS];