diff --git a/board/xilinx/zynq/Makefile b/board/xilinx/zynq/Makefile
index fd93f63..71c0c35 100644
--- a/board/xilinx/zynq/Makefile
+++ b/board/xilinx/zynq/Makefile
@@ -10,3 +10,6 @@
 # Please copy ps7_init.c/h from hw project to this directory
 obj-$(CONFIG_SPL_BUILD) += \
 		$(if $(wildcard $(srctree)/$(src)/ps7_init.c), ps7_init.o)
+
+# Suppress "warning: function declaration isn't a prototype"
+CFLAGS_REMOVE_ps7_init.o := -Wstrict-prototypes