diff --git a/extern/YMF262-LLE/fmopl3.c b/extern/YMF262-LLE/fmopl3.c
index 4e82fb27c..f534ba724 100644
--- a/extern/YMF262-LLE/fmopl3.c
+++ b/extern/YMF262-LLE/fmopl3.c
@@ -74,7 +74,7 @@ void FMOPL3_Clock(fmopl3_t *chip)
         chip->prescaler1_cnt[1] = chip->prescaler1_cnt[0];
     }
 
-    int prescaler1_clk = (chip->reg_test1 & 0x40) != 0 ? chip->input.mclk : !(chip->prescaler1_cnt[1] & 2);
+    int prescaler1_clk = chip->input.mclk; /* Temp: disable prescaler for performance reasons */
 
     chip->aclk1 = !prescaler1_clk;
     chip->aclk2 = prescaler1_clk;