diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 11cc79411e2d..d62c4ac4ae1b 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -36,4 +36,4 @@ obj-$(CONFIG_PCI_ENDPOINT)	+= endpoint/
 obj-y				+= controller/
 obj-y				+= switch/
 
-ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG
+subdir-ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG