diff --git a/Makefile.system b/Makefile.system
index 70a7436e9..1f1cfd16c 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -815,7 +815,7 @@ ifneq ($(EMBEDDED), 1)
 CCOMMON_OPT += -marm
 FCOMMON_OPT += -marm
 else
-CCOMMON_OPT += -DOS_EMBEDDED
+CCOMMON_OPT += -DOS_EMBEDDED -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
 endif
 
 # If softfp abi is mentioned on the command line, force it.