diff --git a/radio/src/Makefile b/radio/src/Makefile
index deb1aa184..f895723b9 100644
--- a/radio/src/Makefile
+++ b/radio/src/Makefile
@@ -411,7 +411,7 @@ ifeq ($(PCB), $(filter $(PCB), STD128 9X128 9XR128))
   ARCH = AVR
   TRGT = avr-
   MCU = atmega128
-  OPT = 2
+  OPT = s
   SDCARD = NO
   THR_TRACE = NO
   EEPROM_VARIANT += ${M128_VARIANT}
@@ -471,7 +471,7 @@ ifeq ($(PCB), $(filter $(PCB), 9X2561))
   ARCH = AVR
   TRGT = avr-
   MCU = atmega2561
-  OPT = 2
+  OPT = s
   SDCARD = NO
   THR_TRACE = YES
   EEPROM_VARIANT += ${M2561_VARIANT}
@@ -532,7 +532,7 @@ ifeq ($(PCB), GRUVIN9X)
   endif
   TRGT = avr-
   MCU = atmega2560
-  OPT = 2
+  OPT = s
   CPPDEFS += -DF_CPU=$(F_CPU)UL -DPCBGRUVIN9X -DCPUM2560 -DEEPROM_VARIANT=0 -DAUDIO -DHAPTIC
   SDCARD = NO
   BUZZER = NO
@@ -572,7 +572,7 @@ ifeq ($(PCB), MEGA2560)
   ARCH = AVR
   TRGT = avr-
   MCU = atmega2560
-  OPT = 2
+  OPT = s
   CPPDEFS = -DF_CPU=$(F_CPU)UL -DPCBMEGA2560 -DCPUM2560 -DEEPROM_VARIANT=0 -DAUDIO -DRTCLOCK
   SDCARD = YES
   THR_TRACE = YES
@@ -618,7 +618,7 @@ ifeq ($(PCB), $(filter $(PCB), SKY9X 9XRPRO))
   endif
   TRGT = arm-none-eabi-
   MCU  = cortex-m3
-  OPT = 2
+  OPT = s
   SDCARD = YES
   BUZZER = NO
   THR_TRACE = YES
@@ -709,7 +709,7 @@ ifeq ($(PCB), TARANIS)
   LDSCRIPT = targets/taranis/stm32_flash_bl.ld
   TRGT = arm-none-eabi-
   MCU  = cortex-m3
-  OPT = 2
+  OPT = s
   CPPDEFS += -DHSE_VALUE=12000000
   SDCARD = YES
   THR_TRACE = YES