diff --git a/Machines/Acorn/Electron/Electron.cpp b/Machines/Acorn/Electron/Electron.cpp
index 511fbe7a6..eb69eced0 100644
--- a/Machines/Acorn/Electron/Electron.cpp
+++ b/Machines/Acorn/Electron/Electron.cpp
@@ -687,6 +687,9 @@ template <bool has_scsi_bus> class ConcreteMachine:
 		}
 
 		inline void signal_interrupt(Interrupt interrupt) {
+			if(!interrupt) {
+				return;
+			}
 			interrupt_status_ |= interrupt;
 			evaluate_interrupts();
 		}