diff --git a/cpu/74xx_7xx/cache.S b/cpu/74xx_7xx/cache.S
index 3a745cb..eac4544 100644
--- a/cpu/74xx_7xx/cache.S
+++ b/cpu/74xx_7xx/cache.S
@@ -245,6 +245,10 @@
  * Disable L1 Instruction cache
  */
 _GLOBAL(icache_disable)
+	mflr	r4
+	bl	invalidate_l1_instruction_cache		/* uses r3 */
+	sync
+	mtlr	r4
 	mfspr	r3, HID0
 	li	r5, 0
 	ori	r5, r5, HID0_ICE