diff --git a/ports/mimxrt/Makefile b/ports/mimxrt/Makefile
index d9c150525d..e08f2ad602 100644
--- a/ports/mimxrt/Makefile
+++ b/ports/mimxrt/Makefile
@@ -366,6 +366,8 @@ endif
 
 CFLAGS += $(CFLAGS_EXTRA)
 
+MPY_CROSS_FLAGS += -march=armv7m
+
 # =============================================================================
 # Linker Flags
 # =============================================================================