diff --git a/configs/p112/ostest/defconfig b/configs/p112/ostest/defconfig
index 2cdc13ba5f9..62162f37e91 100644
--- a/configs/p112/ostest/defconfig
+++ b/configs/p112/ostest/defconfig
@@ -332,7 +332,9 @@ CONFIG_MM_REGIONS=1
 CONFIG_ARCH_HAVE_HEAP2=y
 CONFIG_HEAP2_BASE=0x00000000
 CONFIG_HEAP2_SIZE=0
-# CONFIG_GRAN is not set
+CONFIG_GRAN=y
+CONFIG_GRAN_SINGLE=y
+# CONFIG_GRAN_INTR is not set
 
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