diff --git a/cpu/sa1100/config.mk b/cpu/sa1100/config.mk
index 5be7dfb..9ef4a19 100644
--- a/cpu/sa1100/config.mk
+++ b/cpu/sa1100/config.mk
@@ -32,4 +32,5 @@
 #
 # ========================================================================
 PLATFORM_CPPFLAGS +=$(call cc-option,-mapcs-32,-mabi=apcs-gnu)
+PLATFORM_CPPFLAGS +=$(call cc-option,-mno-thumb-interwork,)
 PLATFORM_RELFLAGS +=$(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))