diff --git a/CRT.c b/CRT.c
index 673e9512..314a70ac 100644
--- a/CRT.c
+++ b/CRT.c
@@ -125,7 +125,7 @@ void CRT_fatalError(const char* note) __attribute__ ((noreturn));
 
 void CRT_handleSIGSEGV(int sgn);
 
-#define KEY_ALT(x) KEY_F(60) + (x - 'A')
+#define KEY_ALT(x) KEY_F(64) + (x - 'A')
 
 }*/
 
diff --git a/CRT.h b/CRT.h
index ba10699e..8753da76 100644
--- a/CRT.h
+++ b/CRT.h
@@ -115,7 +115,7 @@ void CRT_fatalError(const char* note) __attribute__ ((noreturn));
 
 void CRT_handleSIGSEGV(int sgn);
 
-#define KEY_ALT(x) KEY_F(60) + (x - 'A')
+#define KEY_ALT(x) KEY_F(64) + (x - 'A')
 
 
 extern const char *CRT_treeStrAscii[TREE_STR_COUNT];