diff --git a/configs/stm32f429i-disco/highpri/defconfig b/configs/stm32f429i-disco/highpri/defconfig
index a393099e43..210552bdcb 100644
--- a/configs/stm32f429i-disco/highpri/defconfig
+++ b/configs/stm32f429i-disco/highpri/defconfig
@@ -25,7 +25,7 @@ CONFIG_LIBC_FLOATINGPOINT=y
 CONFIG_LIBM=y
 CONFIG_MAX_TASKS=16
 CONFIG_MAX_WDOGPARMS=2
-CONFIG_MM_REGIONS=3
+CONFIG_MM_REGIONS=2
 CONFIG_NFILE_DESCRIPTORS=8
 CONFIG_NFILE_STREAMS=8
 CONFIG_PREALLOC_MQ_MSGS=4