diff --git a/conf/machine/include/tune-cortexm3.inc b/conf/machine/include/tune-cortexm3.inc
index 25d7590..3fba827 100644
--- a/conf/machine/include/tune-cortexm3.inc
+++ b/conf/machine/include/tune-cortexm3.inc
@@ -18,3 +18,4 @@ PACKAGE_EXTRA_ARCHS_tune-cortexm3 ="cortexm3"
 TUNE_FEATURES_tune-cortexm3 = "armv7m vfp cortexm3"
 PACKAGE_EXTRA_ARCHS_tune-cortexm3 = "${PACKAGE_EXTRA_ARCHS_tune-armv7at} armv7m-vfp"
 
+TUNE_CCARGS_MFLOAT = "soft"