diff --git a/arch/arm/boards/globalscale-mirabox/Makefile b/arch/arm/boards/globalscale-mirabox/Makefile
index 9320510..dcfc293 100644
--- a/arch/arm/boards/globalscale-mirabox/Makefile
+++ b/arch/arm/boards/globalscale-mirabox/Makefile
@@ -1 +1 @@
-obj-y += board.c
+obj-y += board.o
diff --git a/arch/arm/boards/solidrun-cubox/Makefile b/arch/arm/boards/solidrun-cubox/Makefile
index 9320510..dcfc293 100644
--- a/arch/arm/boards/solidrun-cubox/Makefile
+++ b/arch/arm/boards/solidrun-cubox/Makefile
@@ -1 +1 @@
-obj-y += board.c
+obj-y += board.o