diff --git a/src/arch/x86/include/arch/romstage.h b/src/arch/x86/include/arch/romstage.h
index 0f9a3589bd..74ec7f4410 100644
--- a/src/arch/x86/include/arch/romstage.h
+++ b/src/arch/x86/include/arch/romstage.h
@@ -41,11 +41,6 @@ void postcar_frame_add_mtrr(struct postcar_frame *pcf,
  */
 void postcar_frame_add_romcache(struct postcar_frame *pcf, int type);
 
-/*
- * Add a common MTRR setup most platforms will have as a subset.
- */
-void postcar_frame_common_mtrrs(struct postcar_frame *pcf);
-
 /*
  * fill_postcar_frame() is called after raminit completes and right before
  * calling run_postcar_phase(). Implementation should call postcar_frame_add_mtrr()
diff --git a/src/arch/x86/postcar_loader.c b/src/arch/x86/postcar_loader.c
index 2efa7ac178..1852eddf23 100644
--- a/src/arch/x86/postcar_loader.c
+++ b/src/arch/x86/postcar_loader.c
@@ -111,7 +111,7 @@ void postcar_frame_add_romcache(struct postcar_frame *pcf, int type)
 	postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE, type);
 }
 
-void postcar_frame_common_mtrrs(struct postcar_frame *pcf)
+static void postcar_frame_common_mtrrs(struct postcar_frame *pcf)
 {
 	if (pcf->skip_common_mtrr)
 		return;