diff --git a/testhal/STM32/multi/USB_CDC/Makefile-stm32f303_discovery b/testhal/STM32/multi/USB_CDC/Makefile-stm32f303_discovery
index 6f65fe01d..0084dd8d9 100644
--- a/testhal/STM32/multi/USB_CDC/Makefile-stm32f303_discovery
+++ b/testhal/STM32/multi/USB_CDC/Makefile-stm32f303_discovery
@@ -76,7 +76,7 @@ endif
 
 # FPU-related options.
 ifeq ($(USE_FPU_OPT),)
-  USE_FPU_OPT = -mfloat-abi=$(USE_FPU) -mfpu=fpv5-sp-d16 -fsingle-precision-constant
+  USE_FPU_OPT = -mfloat-abi=$(USE_FPU) -mfpu=fpv4-sp-d16 -fsingle-precision-constant
 endif
 
 #
diff --git a/testhal/STM32/multi/USB_CDC/Makefile-stm32f407_discovery b/testhal/STM32/multi/USB_CDC/Makefile-stm32f407_discovery
index c729dc170..fbcc490b5 100644
--- a/testhal/STM32/multi/USB_CDC/Makefile-stm32f407_discovery
+++ b/testhal/STM32/multi/USB_CDC/Makefile-stm32f407_discovery
@@ -76,7 +76,7 @@ endif
 
 # FPU-related options.
 ifeq ($(USE_FPU_OPT),)
-  USE_FPU_OPT = -mfloat-abi=$(USE_FPU) -mfpu=fpv5-sp-d16 -fsingle-precision-constant
+  USE_FPU_OPT = -mfloat-abi=$(USE_FPU) -mfpu=fpv4-sp-d16 -fsingle-precision-constant
 endif
 
 #
diff --git a/testhal/STM32/multi/USB_CDC/Makefile-stm32l476_discovery b/testhal/STM32/multi/USB_CDC/Makefile-stm32l476_discovery
index ce41e148f..95471058b 100644
--- a/testhal/STM32/multi/USB_CDC/Makefile-stm32l476_discovery
+++ b/testhal/STM32/multi/USB_CDC/Makefile-stm32l476_discovery
@@ -76,7 +76,7 @@ endif
 
 # FPU-related options.
 ifeq ($(USE_FPU_OPT),)
-  USE_FPU_OPT = -mfloat-abi=$(USE_FPU) -mfpu=fpv5-sp-d16 -fsingle-precision-constant
+  USE_FPU_OPT = -mfloat-abi=$(USE_FPU) -mfpu=fpv4-sp-d16 -fsingle-precision-constant
 endif
 
 #