diff --git a/Makefile b/Makefile
index 5bd7158..bd2cc10 100644
--- a/Makefile
+++ b/Makefile
@@ -376,6 +376,7 @@
 # (of course), but should come after any lines setting CC because the line
 # below uses CC itself.
 override ARCH := $(strip $(call debug_shell,$(CC) $(CPPFLAGS) -E archtest.c 2>/dev/null | grep -v '^\#' | grep '"' | cut -f 2 -d'"'))
+override ENDIAN := $(strip $(call debug_shell,$(CC) $(CPPFLAGS) -E endiantest.c 2>/dev/null | grep -v '^\#'))
 
 # PCI port I/O support is unimplemented on PPC/MIPS/SPARC and unavailable on ARM.
 # Right now this means the drivers below only work on x86.