diff --git a/tools/gmake_scripts/cpu_stm32m4.mk b/tools/gmake_scripts/cpu_stm32m4.mk
index 9e105a36..5acfe8ad 100644
--- a/tools/gmake_scripts/cpu_stm32m4.mk
+++ b/tools/gmake_scripts/cpu_stm32m4.mk
@@ -14,6 +14,11 @@
 # NONE
 #
 
-SRCFLAGS += -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fsingle-precision-constant -falign-functions=16
-LDFLAGS  += -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
-LIBS     += m
+#SRCFLAGS += -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fsingle-precision-constant -falign-functions=16
+#LDFLAGS  += -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fsingle-precision-constant -falign-functions=16
+#DEFS     += CORTEX_USE_FPU=TRUE
+#LIBS     += m
+SRCFLAGS += -mcpu=cortex-m4 -falign-functions=16
+LDFLAGS  += -mcpu=cortex-m4
+DEFS     += CORTEX_USE_FPU=FALSE
+