diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 2ca9114fcf00..0c8436b06c49 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -234,7 +234,7 @@ config PPC_EARLY_DEBUG_40x
 
 config PPC_EARLY_DEBUG_CPM
 	bool "Early serial debugging for Freescale CPM-based serial ports"
-	depends on SERIAL_CPM
+	depends on SERIAL_CPM=y
 	help
 	  Select this to enable early debugging for Freescale chips
 	  using a CPM-based serial port.  This assumes that the bootwrapper