diff --git a/ports/minimal/Makefile b/ports/minimal/Makefile
index 64ad3cc0b2..b3e27509f1 100644
--- a/ports/minimal/Makefile
+++ b/ports/minimal/Makefile
@@ -19,7 +19,7 @@ INC += -I$(BUILD)
 ifeq ($(CROSS), 1)
 DFU = $(TOP)/tools/dfu.py
 PYDFU = $(TOP)/tools/pydfu.py
-CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mabi=aapcs-linux -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant -Wdouble-promotion
+CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mcpu=cortex-m4 -msoft-float -fsingle-precision-constant -Wdouble-promotion
 CFLAGS = $(INC) -Wall -Werror -std=c99 -nostdlib $(CFLAGS_CORTEX_M4) $(COPT)
 LDFLAGS = -nostdlib -T stm32f405.ld -Map=$@.map --cref --gc-sections
 else