diff --git a/xen/arch/x86/cpu/mtrr/generic.c b/xen/arch/x86/cpu/mtrr/generic.c
index b7d329303b..8d4537aeb1 100644
--- a/xen/arch/x86/cpu/mtrr/generic.c
+++ b/xen/arch/x86/cpu/mtrr/generic.c
@@ -557,11 +557,6 @@ static int generic_have_wrcomb(void)
 	return (config & (1ULL << 10));
 }
 
-int positive_have_wrcomb(void)
-{
-	return 1;
-}
-
 /* generic structure...
  */
 const struct mtrr_ops generic_mtrr_ops = {
diff --git a/xen/arch/x86/cpu/mtrr/mtrr.h b/xen/arch/x86/cpu/mtrr/mtrr.h
index 53d369d78f..ec168f9961 100644
--- a/xen/arch/x86/cpu/mtrr/mtrr.h
+++ b/xen/arch/x86/cpu/mtrr/mtrr.h
@@ -31,8 +31,6 @@ extern int generic_validate_add_page(unsigned long base, unsigned long size,
 
 extern const struct mtrr_ops generic_mtrr_ops;
 
-extern int positive_have_wrcomb(void);
-
 /* library functions for processor-specific routines */
 struct set_mtrr_context {
 	unsigned long flags;