diff --git a/zsnes/src/init.asm b/zsnes/src/init.asm
index f721b6bb..efbbfd59 100644
--- a/zsnes/src/init.asm
+++ b/zsnes/src/init.asm
@@ -1464,6 +1464,23 @@ NEWSYM headerhack
     mov byte[MMXSRAMFix],0
     mov dword[Reg4212hack],0
 
+    mov esi,[romdata]
+    add esi,07FC0h
+    cmp dword[esi],'HUMA'
+    jne .nothumangrandprix3
+    cmp dword[esi+4],'N GR'
+    jne .nothumangrandprix3
+    cmp dword[esi+8],'ANDP'
+    jne .nothumangrandprix3
+    mov byte[cycpb268],135
+    mov byte[cycpb358],157
+    mov byte[cycpbl2],125
+    mov byte[cycpblt2],125
+    mov byte[cycpbl],125
+    mov byte[cycpblt],125
+.nothumangrandprix3
+
+
     mov esi,[romdata]
     add esi,07FC0h
     cmp dword[esi],'Cu-O'