diff --git a/drivers/entropy/Kconfig.rv32m1 b/drivers/entropy/Kconfig.rv32m1
index 53032fd4a58..91431ef93e5 100644
--- a/drivers/entropy/Kconfig.rv32m1
+++ b/drivers/entropy/Kconfig.rv32m1
@@ -11,3 +11,9 @@ menuconfig ENTROPY_RV32M1_TRNG
 	help
 	  This option enables the true random number generator (TRNG)
 	  driver based on the RV32M1 TRNG driver.
+
+# Don't use use the RV32M1 TRNG as a random source since it can be quite slow.
+# Instead, use the software implemented xoroshiro RNG.
+choice RNG_GENERATOR_CHOICE
+	default XOROSHIRO_RANDOM_GENERATOR if ENTROPY_RV32M1_TRNG
+endchoice