diff --git a/firmware/export/system.h b/firmware/export/system.h
index b1b5b025a9..121deafc7e 100644
--- a/firmware/export/system.h
+++ b/firmware/export/system.h
@@ -144,6 +144,8 @@ static inline unsigned long SWAB32(unsigned long value)
     return value;
 }
 
+#define invalidate_icache()
+
 #elif CONFIG_CPU == MCF5249
 #define HIGHEST_IRQ_LEVEL (7<<8)
 static inline int set_irq_level(int level)
@@ -178,6 +180,12 @@ static inline unsigned long SWAB32(unsigned long value)
     return (lo << 16) | hi;
 }
 
+static inline void invalidate_icache(void)
+{
+   asm volatile ("move.l #0x81000000,%d0\n"
+		 "movec.l %d0,%cacr");
+}
+
 #elif CONFIG_CPU == TCC730
 
 extern void* volatile interrupt_vector[16]  __attribute__ ((section(".idata")));
@@ -223,6 +231,8 @@ static inline unsigned long SWAB32(unsigned long value)
     return (lo << 16) | hi;
 }
 
+#define invalidate_icache()
+
 #endif
 #endif