diff --git a/zsnes/src/cpu/execute.asm b/zsnes/src/cpu/execute.asm
index 5eb23ab4..a2a47fb5 100644
--- a/zsnes/src/cpu/execute.asm
+++ b/zsnes/src/cpu/execute.asm
@@ -605,6 +605,7 @@ NEWSYM init18_2hz
     ret
 
 %ifdef __MSDOS__
+EXTSYM Game60hzcall
 NEWSYM handler8h
     cli
     push ds