diff --git a/src/emu/cpu/psx/irq.c b/src/emu/cpu/psx/irq.c
index b96f61ad530..6bde04640ad 100644
--- a/src/emu/cpu/psx/irq.c
+++ b/src/emu/cpu/psx/irq.c
@@ -125,7 +125,7 @@ WRITE_LINE_MEMBER( psxirq_device::intin1 )
 {
 	if( state )
 	{
-		set( 1 << 3 );
+		set( 1 << 1 );
 	}
 }
 
@@ -133,7 +133,7 @@ WRITE_LINE_MEMBER( psxirq_device::intin2 )
 {
 	if( state )
 	{
-		set( 1 << 3 );
+		set( 1 << 2 );
 	}
 }
 
@@ -149,7 +149,7 @@ WRITE_LINE_MEMBER( psxirq_device::intin4 )
 {
 	if( state )
 	{
-		set( 1 << 3 );
+		set( 1 << 4 );
 	}
 }
 
@@ -157,7 +157,7 @@ WRITE_LINE_MEMBER( psxirq_device::intin5 )
 {
 	if( state )
 	{
-		set( 1 << 3 );
+		set( 1 << 5 );
 	}
 }
 
@@ -165,7 +165,7 @@ WRITE_LINE_MEMBER( psxirq_device::intin6 )
 {
 	if( state )
 	{
-		set( 1 << 3 );
+		set( 1 << 6 );
 	}
 }
 
diff --git a/src/emu/cpu/psx/irq.h b/src/emu/cpu/psx/irq.h
index 2c5114b70a4..3381ea55f3d 100644
--- a/src/emu/cpu/psx/irq.h
+++ b/src/emu/cpu/psx/irq.h
@@ -34,8 +34,6 @@ public:
 	DECLARE_WRITE_LINE_MEMBER( intin9 );
 	DECLARE_WRITE_LINE_MEMBER( intin10 );
 
-	void set( UINT32 bitmask );
-
 protected:
 	virtual void device_start();
 	virtual void device_reset();
@@ -43,6 +41,7 @@ protected:
 
 private:
 	void psx_irq_update( void );
+	void set( UINT32 bitmask );
 
 	UINT32 n_irqdata;
 	UINT32 n_irqmask;