diff --git a/cpuops.cpp b/cpuops.cpp
index c943f8fd..5dae1244 100644
--- a/cpuops.cpp
+++ b/cpuops.cpp
@@ -1637,7 +1637,10 @@ static void Op58 (void)
 {
 	ClearIRQ();
 	AddCycles(ONE_CYCLE);
-	CHECK_FOR_IRQ();
+
+#ifndef SA1_OPCODES
+        CPU.IRQLine = FALSE;
+#endif
 }
 
 // SEI