diff --git a/sys/powerpc/booke/machdep_ppc4xx.c b/sys/powerpc/booke/machdep_ppc4xx.c
index 69a1e2e7a97d..256d14bb86e2 100644
--- a/sys/powerpc/booke/machdep_ppc4xx.c
+++ b/sys/powerpc/booke/machdep_ppc4xx.c
@@ -114,11 +114,6 @@ booke_enable_l2_cache(void)
 {
 }
 
-void
-booke_enable_l3_cache(void)
-{
-}
-
 void
 booke_disable_l2_cache(void)
 {
diff --git a/sys/powerpc/include/machdep.h b/sys/powerpc/include/machdep.h
index 401a4a1bccdb..fd5e694d8bbc 100644
--- a/sys/powerpc/include/machdep.h
+++ b/sys/powerpc/include/machdep.h
@@ -32,7 +32,6 @@
 void booke_disable_l2_cache(void);
 void booke_enable_l1_cache(void);
 void booke_enable_l2_cache(void);
-void booke_enable_l3_cache(void);
 void booke_enable_bpred(void);
 void booke_init_tlb(vm_paddr_t);